L-803087 is a potent and selective agonist of the growth inhibitor sst4 receptor with a Ki value of 0.7 nM for sst4, demonstrating over 280-fold selectivity compared to other growth inhibitory receptors.

CYN 154806 is a potent and selective somatostatin sst2 receptor antagonist, The pIC50 values are 8.58, 5.41, 6.07, 5.76 and 6.48 for human recombinant sst2, sst1, sst3, sst4 and sst5 receptors respectively.

Cortistatin 14 is a neuropeptide expressed in inhibitory neurons of the cerebral cortex. Depresses neuronal activity, and induces slow-wave sleep, likely through antagonism of acetylcholine. It is structurally and functionally similar to somatostatin 14. Competes with somatostatin 14 for binding of somatostatin receptors (IC50s=5, 0.09, 0.3, 0.2, and 0.3nM for receptors sst1-5, respectively).