Constitution and conformation determine the biological activity of a peptide, as demonstrated by comparative investigations of the inhibition of cholate uptake in liver cells by somatostatin, antamanide, cyclolinopeptide A and 1 and 2. The crystal structure of 1 is the same as that of 2 over a wide range and both react strongly cytoprotectively.
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Kessler et al. (1986) studied this question.
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