Referring to events that occur after transcription.
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post·tran·scrip·tion·al -tran(t)s-'krip-shnəl, -shən-əl adj occurring, acting, or existing after genetic transcription <\posttranscriptional control of messenger-RNA production>
post·tran·scrip·tion·al·ly -ē adv
Medical dictionary. 2011.