Sentigen Holding Corp. Stockholders Approve Merger with Invitrogen 
Corporation 

Sentigen Holding Corp. SGHL Merger with Invitrogen Corporation IVGN

Sentigen Holding Corp. (Nasdaq:SGHL) today announced that at the 
special meeting of stockholders held today, Sentigen stockholders 
approved the adoption of the agreement and plan of merger with 
Invitrogen Corporation (Nasdaq:IVGN), a global leader in life 
sciences. The transaction was approved by more than 50% of the shares 
outstanding. Based on discussions to date with Invitrogen, and 
contingent upon the satisfaction of specified closing conditions, 
Sentigen believes that the merger with Invitrogen will be completed 
within the next several weeks. 

As previously announced, on August 31, 2006, Sentigen and Invitrogen 
entered into a definitive merger agreement under which Invitrogen 
will acquire Sentigen in a cash transaction at a price of $3.37 per 
share for all shares currently issued and outstanding. 

Prior to the merger, it is expected that Sentigen will distribute the 
shares of SentiSearch, Inc., a newly-formed corporation, in a taxable 
transaction, pro rata to the then existing stockholders of Sentigen. 
SentiSearch, Inc. is expected to be a publicly traded company, 
initially holding certain olfaction intellectual property previously 
owned by Sentigen. 

Additional Information about the proposed merger and where you can 
find it 

In connection with the proposed merger, Sentigen has filed a proxy 
statement and other relevant materials with the Securities and 
Exchange Commission ("SEC"). The proxy statement and other relevant 
materials, and any other documents filed by Sentigen with the SEC, 
may be obtained free of charge at the SEC's web site at www.sec.gov. 

About Sentigen Holding Corp. 

Sentigen Holding Corp. conducts business through two wholly-owned 
operating subsidiaries: Sentigen Biosciences, Inc. ("Sentigen 
Biosciences") and Cell & Molecular Technologies, Inc. ("CMT"). CMT 
provides contract research and development services to companies 
engaged in the drug discovery process in the following areas: 
molecular and cell biology, gene expression and protein biochemistry, 
bio-processing, high throughput screening support services, mouse 
genetics, and cell-based GPCR selectivity profiling. Sentigen 
Biosciences has been primarily engaged in the development and 
commercialization of novel bioassay systems that elucidate the 
underlying biology of protein-protein interactions. Sentigen 
Biosciences has initially targeted its Tango™ Assay System to address 
the functionalization of G protein-coupled receptors (GPCRs) for 
pharmaceutical drug discovery and development. For more information 
on our companies, please visit their respective websites: www.cmt-
inc.net and www.sentigen.com. 

Safe Harbor Statement 

This news release includes forward-looking statements that involve 
risks and uncertainties. Although Sentigen believes such statements 
are reasonable, it can make no assurance that such statements will 
prove to be correct. Such statements are subject to certain factors 
that may cause results to differ materially from the forward-looking 
statements. Such factors include the risk factors discussed in 
Sentigen's filings with the Securities and Exchange Commission, 
including its most recent Annual Report on Form 10-K and the merger 
proxy dated October 13, 2006, copies of which may be obtained from 
Sentigen without charge. Sentigen undertakes no obligation to 
publicly release results of any of these forward-looking statements 
to reflect events or circumstances after the date hereof or to 
reflect the occurrence of unexpected results. 





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