Hey, I am going to generate GeneA+GeneB Knockin mouse in one locus.Furin cleavage site plus P2A or T2A linker are chosen to link GeneA and GeneB. This way, co-translation of GenaA and GeneB under endogenous promoter should be achieved. I googled Furin cleavage site sequence, but i can't find out accurate and reliable sequence ever used in vivo. So, if someone used or know furin cleavage site, would you please send me the information and reference? Moreover, i just read the furin cleavage, do i need express furin protein or the furin protein is already reside in cell? Thanks!