<PAGE>
EXHIBIT 4.1
Keryx Biopharmaceuticals, Inc.
40,000,000 SHARES PAR VALUE $.001 EACH
COMMON STOCK
See Reverse for
Certain Definition
This is to Certify that_________________________________________is the owner of
________________________________________________________________________________
FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK OF
Keryx Biopharmaceuticals, Inc.
transferable on the books of the Corporation by the holder hereof in person or
by duly authorized Attorney upon surrender of this Certificate properly
endorsed. Witness, the seal of the Corporation and the signatures of its duly
authorized officers.
Dated
SECRETARY PRESIDENT
