agrin

Agrin is a large proteoglycan whose best-characterised role is in the development of the neuromuscular junction during embryogenesis. Agrin is named based on its involvement in the aggregation of acetylcholine receptors during synaptogenesis.

1. He stood there, agrin, waiting for the good news.
   他微笑着站在那里，等待好消息。
2. The children played happily in the park, their faces agrin with joy.
   孩子们在公园里快乐地玩耍，脸上洋溢着欢快的笑容。