 Its main function includes catalyzing the transfer of a methyl group from S-Adenosyl methionine to the side chain nitrogens of arginine residues within proteins to form methylated arginine derivatives and S-Adenosyl-L-homocysteine.CARM1 is a secondary coactivator through its association with p160 family (SRC-1, GRIP1, AIB) of coactivators.It is responsible for moving cells toward the inner cell mass in developing blastocysts.