Why the introns of mRNA strand not take part in protein synthesis?
“An intron is a DNA region within a gene that is not translated into protein. … Alternative splicing of introns within a gene may introduce greater variability of protein sequences translated from a single gene. The control of mRNA splicing is performed by a wide variety of signaling molecules. Introns may also contain “old code”, or sections of a gene that were once translated into a protein, but have since become inactive. It was generally assumed that the sequence of any given intron is junk DNA with no biological function.
