Signal ( leaser ) sequence a hydrophobic sequence at the amino terminus of a polypeptide chain that targets it for secretion in bacterial or incorporation into the endoplasmic reticulum in eukaryotic cells 讯息（指挥）序列蛋白质末端的一段疏水性氨基酸，在细菌中引导蛋白质分泌或在真核细胞中将蛋白质并入内质网。
