1. Akil, H., Young, E. and Watson, S.J., Opiate binding properties of naturally occurring N- and C-terminus modified beta-endorphins, Peptides, 2 (1981) 289–292.
2. Bals-Kubik, R., Herz, A. and Shippenberg, T.S., β-Endorphin-(1–27) is a naturally occurring antagonist of the reinforcing effects of opioids, N.-S. Arch. Pharmacol., 338 (1988) 392–396.
3. Banks, W.A., Kastin, A.J., Akerstrom, V. and Jaspan, J.B., Radioactively iodinated cyclo(His-Pro) crosses the blood–brain barrier and reverses ethanol-induced narcosis, Am. J. Physiol., 264 (1993) E723–E729.
4. Bauer, K., Gräf, K.J., Faivre-Bauman, A., Beier, S., Tixier-Vidal, A. and Kleinkauf, H., Inhibition of prolactin secretion by histidyl-proline-diketopiperazine, Nature, 274 (1978) 174–175.
5. Bolme, P., Fuxe, K., Agnati, L.F., Bradley, R. and Smythies, J., Cardiovascular effects of morphine and opioid peptides following intracisternal administration in chloralose-anesthetized rats, Eur. J. Pharmacol., 48 (1978) 319–324.