Assertion: ligand's receptor | /r/HasProperty | watson et al.
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Source sentences:
text: In the case of NK 1 receptors (originally called SP-P receptors), the initial starting point was the endogenous peptide, substance P. Methyl esterification of the carboxyl-terminal amide of SP preserved affinity to the NK 1 receptor while decreasing by approximately 99.9% the affinity to the NK 2 (previously named SP-E) and NK 3 receptors (previously termed SP-N) (Watson et al., 1983).