insulin (proinsulin; C-peptide

Assessment of Insulin Secretion in the Mouse

, proinsulin. Insulin and C-peptide are produced when endopeptidases, prohormone convertases 2 and 3 (PC2 and PC3, respectively), cleave proinsulin at two paired basic amino acid sites, Lys 64 -Arg 65 and Arg 31 -Arg 32 (

胰岛素insulin

　　胰岛素 insulin 脊椎动物胰腺中兰氏岛（ Yangerhans）的β细胞分泌的激素。 1921年由 F.G.Banting和 C.H.Best所发现。 insulin一名系由 insula（岛）而来。胰岛素可用酸性乙醇从胰腺中提取。 1926年 J.J.Abel已分离出胰岛素结晶，结晶中含有微量锌。单体的分子量为 5700，在中性溶液中可互相融合。 F.Sanger就作为牛胰岛素的蛋白质曾首次确定了其氨基酸的排列顺序（ 1955）。胰岛素的结构是，通过 S— S键

Analysis of Insulin and Insulin-Like Growth Factor-I Receptors in Neural Tissues

A variety of biochemical and physiological studies in recent years have made it clear that the brain possesses specific receptors and puta- tive signal transduction pathways for insulin and the insulin-like growth factors (IGF-I and IGF