(countertransport 的第三人称 -s形式) [医]双向转运, 抗衡转运：两种物质从相对方向同时跨膜转运, 可由同一载体, 亦可由互有生化关连的不同载体进行

-s form of countertransport

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2-hydroxy-4-aminobutyrate

biosomeric contamination