同义替代不引起氨基酸改变，它们基本是中性替代速率；
Synonymous substitution rate nearly is neutral, which not chang amino acids of protein;
但是当用生物可降解物质替代这些中性辅料时会发生什么呢？
But what would happen if biodegradable materials were used instead of these neutral excipients?
在异育银鲫饲料中，中性植酸酶部分替代磷酸二氢钙可以提高饲料磷利用率、降低磷排放量，从而带来经济效益和生态效益。
Neutral phytase partial replacing MCP in Carassius auratus gibelio diet can improve the utilization of phosphorus and reduce the phosphorus discharge, thus brings economical and ecological benefits.
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