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Stock Trading History of Whitehouse Laura

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Whitehouse Laura since year 2005. The trader's CIK number is 1289428. At the time of this reporting, Whitehouse Laura is the Vice President of Repligen Corp (stock ticker symbol RGEN).

Stock purchases, sales, and option exercises reported by *Whitehouse Laura* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2006-03-01	RGEN	Repligen Corp	Sale	1,800	4.50	8,100
2006-02-28	RGEN	Repligen Corp	Sale	8,200	4.52	37,023
2006-03-01	RGEN	Repligen Corp	Option Exercise	1,800	1.25	2,250
2006-02-28	RGEN	Repligen Corp	Option Exercise	8,200	1.25	10,250
2005-08-02	RGEN	Repligen Corp	Sale	2,825	3.10	8,757

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Whitehouse Laura (Vice President of Repligen Corp at the time of this reporting) see the Securities and Exchange Commission (SEC) website.