The lengths of protein-coding regions of these cDNAs for BiP, Crt and PDI are 1965, 1254, and 1533 bp, respectively. Each protein has a signal peptide and a KDEL motif in N- and C-terminal parts respectively, showing its intracellular localization to be the lumen of the ER. These stress proteins are highly conserved, showing that their similarities among mammals are more than 90% in the level of amino acid. The expression of the genes for stress proteins differed among the monkey tissues examined. BiP and PDI gene expression was predominant in secretory tissues such as liver and kidney, and brain tissues. But Crt gene expressed rather ubiquitously in a variety of tissues.
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