We are hoping to monitor phosphorylation of E2F1 by ATM/ATR at Ser31 by western blotting. However, while this modification has has been widely reported in the literature, I have not been able to find an antibody against this modification.
One paper from 2013 states that no such antibody is commercially available; however, I am hoping that the intervening two years have seen one brought to market. Does anyone know where I may be able to source an antibody against this post-translational modification?
Thanks in advance for your help!