ABSTRACT
G ene expression is regulated at d ifferen t levels: transcrip tio n , translation and posttranslation (Fig 23.1).
Cells use different modes of translational control1 2 like phosphorylation of initiation factors, poly (A) tail shortening of the cyto plasmic messenger RNA, mRNA repression by mRNA binding proteins and desta bilization of messenger RNA by site specific endonucleases.