Putative in vivo kinases: 

An enzyme-substrate reaction that occurs within living cells; includes cultured cells, ex vivo samples, and intact organisms. In the case of kinases, the large number of protein kinases in intact cells makes exact identification of the responsible kinase challenging.

Titin S157-p
Regulatory protein:
ADRB1 S161-p
isoproterenol S157-p , S161-p