And tiny bacteria will have trouble secreting the larger spidroin proteins.

而微小的细菌难以分泌出大的蛛丝蛋白。

They then secrete a signaling protein that converts surrounding cells into bone-forming cells.

它们然后分泌一种信号蛋白质，该蛋白质将周围的细胞变为可形成骨头的细胞。

To do this, mussels secrete a gluey protein.

为此，贻贝会分泌一种胶状蛋白质。

Then, progenitor cells, which can develop into various bodily tissues, form a mass at the site of injury and nearby nerves secrete growth-promoting proteins.

然后，可以发育成各种身体组织的祖细胞在受伤部位形成团块，附近的神经分泌促进生长的蛋白质。