One regulatory step in the process of gene expression and synthesis of proteins is the actual modification of proteins themselves, which is called:

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Post-translational modification refers to the process of modifying the protein after it has been synthesized. This can include processes such as phosphorylation, glycosylation, and acetylation, which can affect the protein's function, stability, and localization. Alternative splicing refers to the process of selectively splicing different exons together to produce different mRNA transcripts and ultimately different protein isoforms. Transcriptional modification and post-protein modification are not commonly used terms in the context of gene expression and protein synthesis. Alternative modification is not a recognized term in this context.

One Regulatory Step in the Process of Gene Expression and Synthesis