Answer: agrin

AnswerCrossword Clue
AGRINWith a broad smile.
AGRINSmiling.
AGRINBeaming broadly.
AGRINSmiling broadly.
AGRINSmiling broadly
AGRINBeaming broadly
AGRINSmiling
AGRINBeaming
AGRINWearing -- (smiling broadly)
AGRINBroadly smiling
agrina proteoglycan that plays a role in the development of the neuromuscular junction