Human defensins,found in the blood,intestinal tract and epithelial cells,are small,cystin-rich cationic peptides with special structure.
人类防御素是一种存在于血液、肠道及表皮细

有特殊空间结构,富含
氨酸的阳离子多肽。
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分泌
We also talked about how epithelial cells are polar, having both apical and basal sides, and are selectively permeable, and lastly we took a brief look at how our glandular epithelial tissue forms both out endocrine and exocrine glands.
我们还讨论了上皮细胞是如何极性的,具有顶端和基底两侧,并且具有选择性渗透性,最后我们简要了解了我们的腺上皮组织如何形成
分泌腺和外分泌腺。