Power of Attorney

The undersigned, Julia R. Brown, a director of
Tanox, Inc., a Delaware corporation ("Tanox"), hereby designates Nancy T.
Chang and Katie-Pat Bowman, and each of them, her true and lawful
attorney-in-fact and agent, with full power of substitution and
resubstitution, for her and in her name, place and stead, in any and all
capacities, to sign any and all Forms 4 and 5, including amendments
thereto, disclosing changes in his beneficial ownership of securities and
derivative securities of Tanox and to file the same with the Securities and
Exchange Commission, granting said attorney-in-fact and agent, and any of
them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as
fully to all intents and purposes as she might or could do in person,
hereby ratifying and confirming all that said attorney-in-fact and agent,
or any of them, or her or their substitute or substitutes, may lawfully do
or cause to be done by virtue hereof.  This power of attorney shall remain
effective until revoked by the undersigned.


Date:  June 13,
2005				Julia R. Brown