Source:http://linkedlifedata.com/resource/umls/id/C0206355
MSH: Proteins that are coded by immediate-early genes, in the absence of de novo protein synthesis. The term was originally used exclusively for viral regulatory proteins that were synthesized just after viral integration into the host cell. It is also used to describe cellular proteins which are synthesized immediately after the resting cell is stimulated by extracellular signals.,CSP: proteins that regulate the expression of genes of other kinetic classes.