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Synthetic Biologics and Intrexon Corporation

Key Takeaway: Synthetic Biologics and Intrexon Corporation Initiate Development of Novel Biologics for a Subset of Patients Suffering from Irritable Bowel Syndrome (IBS) - New Anti-Infective Program Underway Based on Innovative IBS Target - Rockville, MD, and Germantown, MD, December 9,

Full Press Release Details

Synthetic Biologics and Intrexon Corporation
Initiate Development of
Novel Biologics for a Subset of Patients
Suffering from Irritable Bowel Syndrome (IBS)
- New Anti-Infective Program
Underway Based on Innovative IBS Target -
Rockville, MD, and Germantown, MD, December
9, 2013 - Synthetic Biologics, Inc. (NYSE MKT: SYN), a developer of product candidates focused on the prevention and
treatment of serious infectious diseases and other diseases, and Intrexon Corporation (NYSE: XON) ("Intrexon"), a leader
in synthetic biology, announced today that they have initiated development of novel biologic approaches for the prevention, as
well as the acute and chronic treatment of a subset of irritable bowel syndrome (IBS) pathologies specifically caused by auto-antibodies.
Synthetic Biologics intends to utilize
intellectual property optioned from Cedars-Sinai Medical Center ("Cedars-Sinai"). According to an increasing body of
recent work conducted by Cedars-Sinai, a subset of IBS cases appear to be causally initiated by one or more encounters with acute
infectious gastroenteritis, such as the foodborne illness, Campylobacter jejuni. Cedars-Sinai has identified a novel autoimmune
target for this subset of IBS cases because of the development of cross-reacting antibodies between a bacterial toxin and a protein
important for controlling gastrointestinal motility.
"We are thrilled to begin work with
Intrexon for the development of novel biologic therapeutics targeted at preventing and treating auto-antibody-induced IBS. By accessing
Intrexon's proprietary technologies and capabilities, we will pursue development of a vaccine against the bacterial toxin,
which does not yield cross reactivity with the gastrointestinal motility protein. Additionally, we will pursue novel approaches
to treat acute exposure of the bacterial toxin, as well as block the activity of the auto-antibodies," said Jeffrey Riley,
Chief Executive Officer of Synthetic Biologics, Inc.
Samuel Broder, M.D., Senior Vice President
of Intrexon's Health sector and former Director of the National Cancer Institute stated, "Existing IBS therapies, which are
primarily focused on supportive care, are unlikely to address the treatment needs of the patient population with auto-antibodies,
an underlying immune-specific pathology. This new collaboration represents an important opportunity to address the unmet medical
need in these patients with personalized medicine. The collaboration will target the root causes of a subset of irritable bowel
syndrome-associated pathologies, and could have a significant impact on the prevention and therapy of this serious disorder."
The initiation of biologic development
for the prevention and treatment of both forms of IBS is the third pathogen-specific indication Synthetic Biologics intends to
pursue as part of its August 2012 worldwide exclusive channel collaboration with Intrexon. Under this collaboration, the Company
intends to utilize Intrexon's comprehensive suite of proprietary technologies, including their extensive Protein Engineering
assets, mAbLogix , and LEAP platforms, to develop biologics to specifically and rapidly neutralize/clear pathogens
that cause serious infectious diseases and other diseases. The first two target indications under the Intrexon collaboration
continue to make well-paced progress. The development of a monoclonal antibody (mAb) therapy to treat life-threatening whooping
cough (Pertussis) is expected to initiate an IND-enabling study during the first quarter of 2014. The generation of a panel of
antibodies to target the multidrug-resistant pathogen, Acinetobacter, is ongoing. While Synthetic Biologics has initiated
development of the initial three targets, the Intrexon collaboration may optionally be expanded to include up to a total of eight
pathogen-specific indications.
About Synthetic Biologics, Inc.
Synthetic Biologics, Inc. (NYSE MKT: SYN)
is a biotechnology company focused on the development of product candidates for serious infectious diseases and other diseases.
Synthetic Biologics is developing oral treatments targeting archaea, a non-bacterial intestinal form of life increasingly associated
with chronic diseases such as irritable bowel syndrome (IBS), obesity and type 2 diabetes, an oral biologic to protect the gastrointestinal
microflora from the effects of IV antibiotics for the prevention of C. diff infection, a series of monoclonal antibodies
(mAbs) for the treatment of Pertussis and Acinetobacter infections, and a biologic targeted at the prevention and treatment
of IBS. In addition, the Company is developing an oral estriol drug candidate for the treatment of relapsing-remitting multiple
sclerosis (MS) and cognitive dysfunction in MS (with results of an ongoing 164 subject, 15 center, two-year, double blind, placebo
controlled, Phase II relapsing-remitting MS clinical trial expected to be announced during the first half of 2014). For more information,
please visit Synthetic Biologics' website at www.syntheticbiologics.com.
About Intrexon Corporation
Intrexon Corporation (NYSE: XON) is a leader
in synthetic biology focused on collaborating with companies in Health, Food, Energy and the Environment to create biologically-based
products that improve the quality of life and the health of the planet. Through the Company's proprietary UltraVector platform,
Intrexon provides its partners with industrial-scale design and development of complex biological systems. The UltraVector
platform delivers unprecedented control over the quality, function, and performance of living cells. We call our synthetic biology
approach and integrated technologies Better DNA , and we invite you to discover more at www.dna.com.
Trademarks: mAbLogix , LEAP ,
UltraVector , and Better DNA are trademarks of Intrexon Corporation.
This release includes forward-looking
statements on Synthetic Biologics' current expectations and projections about future events. In some cases forward-looking
statements can be identified by terminology such as "may," "should," "potential," "continue,"
"expects," "anticipates," "intends," "plans," "believes," "estimates,"
and similar expressions. These statements are based upon current beliefs, expectations and assumptions and are subject to a number
of risks and uncertainties, many of which are difficult to predict and include statements regarding the timeline for the Pertussis
IND-enabling study, Synthetic Biologics' use of Intrexon's technologies and Cedar-Sinai intellectual property and the
intended results of such use, the impact of the Intrexon collaboration on the prevention and therapy of certain irritable bowel
syndrome associated pathologies. The forward-looking statements are subject to risks and uncertainties that could cause actual
results to differ materially from those set forth or implied by any forward-looking statements. Important factors that could cause
actual results to differ materially from those reflected in Synthetic Biologics' forward-looking statements include, among
others, a failure of Synthetic Biologics' technologies for the treatment of infectious diseases and other diseases to be
successfully developed or commercialized, a failure of the Intrexon's intellectual property to develop the necessary biologics,
an inability to obtain regulatory approval of the infectious disease and other disease product candidates, a failure of the results
of clinical trials to support the efficacy or safety of product candidates, a failure of the preclinical or clinical trials to
proceed on schedules that are consistent with Synthetic Biologics' current expectations or at all, Synthetic Biologics'
inability to protect its intellectual property and freedom to operate without interference of the patents of others, inability
to maintain the effectiveness of the exclusive collaboration agreement, its reliance on third parties to develop its product candidates,
the insufficiency of existing capital reserves to fund continued operations for a particular amount of time and uncertainties regarding
Synthetic Biologics' ability to obtain additional financing to support its operations thereafter and other factors described
in Synthetic Biologics' report on Form 10-K for the year ended December 31, 2012 and any other filings with the SEC. The
information in this release is provided only as of the date of this release, and Synthetic Biologics undertakes no obligation to
update any forward-looking statements contained in this release on account of new information, future events, or otherwise, except
For further information, please contact:
Synthetic Biologics, Inc.
Vice President, Corporate Communication
(734) 332-7800, Ext. 22
Intrexon Corporation
Vice President, Corporate Communications
Last updated: Dec 10, 2013