<PAGE>
EXHIBIT 99.6
YOUR VOTE IS VERY IMPORTANT
August 14, 2000
Dear Stockholder:
On September 14, 2000 Invitrogen Corporation will conduct a special meeting of
stockholders. Regardless of the number of shares you own, your vote is very
important. To ensure that your shares are represented, we urge you to vote your
shares as soon as possible.
Please follow the voting instructions given to you in the documents provided.
Should you have any questions, call our proxy solicitor, Beacon Hill Partners,
at 1-800-350-6580.
Thank you for your cooperation and support.
Sincerely,
INVITROGEN CORPORATION
