Five heptapeptide amides related to the C-terminal portion of tachykinins and two heptapeptide amides related to the C-terminal portion of bombesin-like peptides were synthesized and the smooth muscle contractile activity of these peptides was compared with that of the C-terminal heptapeptide of substance P by taking synthetic substance P as a standard.
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Kitagawa et al. (1979) studied this question.