Embryos of the brine shrimp,Artemia franciscana, exhibit remarkable resistance to physiological stress, which is tem-porally correlated with the presence of two proteins, one a small heat shock/a-crystallin protein termed p26 and the other called artemin, of unknown was sequenced previously by Edman degradation, and its rela-tionship to ferritin, an iron storage protein, isolation from anArtemiaexpressed sequence tag library of artemin and ferritin cDNAs extends this work. .