Dj2 is a member of the DnaJ family of proteins, which regulate the chaperoning functionof the isolated a monkey cDNA dj2 clone corresponding to the large mRNA species encoded by the gene. This mRNA differs from the small mRNAproduced by the same gene in that it contains a long 3¢ untranslated region. Both messages were found to be equally stable and to produce the same protein, which is susceptible to farnesylation.