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To investigate the intracellular processing of endothelin-1 (ET-1), the synthesis and secretion of preproET-1 (PPET-1) was studied in transiently transfected COS-7 cells. Replacements at the highly conserved C-terminal region of ET-1 were made by site-directed mutagenesis, with codons for residues Ile-20 and Trp-21 being replaced by one for Ala in the PPET-1 cDNA. The mutant and wildtype PPET-1 cDNAs...
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