the tissue-selective binding of the two principal bioactive forms of somatostatin , somatostatin-14 ( ss-14 ) and somatostatin-28 ( ss-28 ) , their ability to modulate camp-dependent and -independent regulation of post-receptor events to different degrees and the documentation of specific labelling of ss receptor subtypes with ss-28 but not ss-14 in discrete regions of rat brain suggest the existence of distinct ss-14 and ss-28 binding sites .
C0037659
ss-14
C0074854
ss-28