Xytronyx, Inc.

Gerald Odstrchel

George L Leung

Sunil J Sirdesai

Photochromic ink comprising a spiroheterocycle or metal dithiozonate photochromic dye.

Reversible inks

Method for determining the presence of an aminotransferase (AT.sub.1), other than aspartate aminotransferase (AST), in a biological sample. The method includes contacting the sample with an amino donor substrate for AT.sub.1, an amino acceptor substrate for AT.sub.1, cysteine sulfinic acid (CSA) in excess, a second aminotransferase (AT.sub.2), different from AT.sub.1, in excess, and an indicator for the presence of sulfite ions, under conditions in which the concentration of said AT.sub.1 can be determined by the amount of the indicator which forms a detectable signal.

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San Juan Capistrano, CA, United States of America

Gerald Odstrchel