Posttranscriptional is a related term of posttranscriptionally.

In genetics|lang=en terms the difference between posttranscriptional and posttranscriptionally

is that posttranscriptional is (genetics) subsequent to the transcription of rna while posttranscriptionally is (genetics) subsequently to the transcription of rna.

As an adjective posttranscriptional

is (genetics) subsequent to the transcription of rna.

As an adverb posttranscriptionally is

(genetics) subsequently to the transcription of rna.