Exhibit 99.1 ------------Exhibit 99 • February 14th, 2001 • Venrock Associates • Services-commercial physical & biological research
Contract Type FiledFebruary 14th, 2001 Company IndustryPursuant to Rule 13d-1(k)(1) promulgated pursuant to the Securities Exchange Act of 1934, as amended, the undersigned agree that the attached Schedule 13G is being filed on behalf of each of the undersigned.