Citrullination is the process of posttranslational modification of arginine residues.
2
西瓜：西瓜里富含瓜氨酸，这是一种可以转化为精氨酸的氨基酸，而精氨酸又可以变成一氧化氮。
Watermelons: Watermelons are a rich source of citrulline, an amino acid that can be made into arginine, which then gets converted to nitric oxide.
3
瓜氨酸转换成精氨酸，Patil说，“这是一氧化氮的前身，而一氧化氮将帮助舒张血管。”
The amino acid citrulline is converted into the amino acid arginine, Patil says. "This is a precursor for nitric oxide, and the nitric oxide will help in blood vessel dilation."
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