在植物和动物的生长发育过程中，甾醇和肽类激素被广泛地作为信号转导分子来使用。
Steroids and peptide hormones are widely used as signaling molecules in both plants and animals during growth and development.
作者认为这种细胞属于内分泌细胞，并且很可能是分泌肽类激素的APUD细胞。
It is suggested that these cells may be of endocrine cells, and highly probably of APUD cells secreting polypeptide hormones.
人绒毛膜促性腺激素、人胎盘生乳素是胎盘滋养细胞合成和分泌的肽类激素。
Human chorionic gonadotropic (hCG) and human placental latogen (hPL) are peptide hormones produced and excreted by placental trophoblastic cells during pregnancy.
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