Structure and function of erabutoxins and related neurotoxins from sea snakes and cobras.

This raises the possibility that the processing mechanisms may differ in different tissues. Since bovine /.-endorphin appears to have the same primary structure as rat /.-endorphin (Rubinstein et al., 1977; Li et al., 1977), it is anticipated that the four peptides isolated from ox pituitary, described here, will prove valuable as ‘marker’ peptides in studies on the distribution of /.-endorphin in regions of rat pituitary and brain. Bradbury, A. F., Smyth, D. G. & Snell, C. R. (1975) in Peptides: Structure and Biological Activity (Walter, R. & Meienhofer, J.. eds.), pp. 609-6 I5 Ann Arbor Sci., Ann Arbor, MI Bradbury, A. F., Smyth, D. G., Snell, C. R., Birdsall, N. J. M. & Hulme, E. C. (1 976a) Nature (London) 260,625-626 Bradbury, A. F., Feldberg, W. S., Smyth, D. G. & Snell, C. R. (19766) in Opiates and Endogenous Opioid Peptides (Kosterlitz, H. W., ed.). pp. 9-17, North-Holland, Amsterdam Deakin, J. F. W., Dostrovsky, J. 0. & Smyth, D. G. (1980) Biochem. J.