What American biochemist, born February 1869 was first responsible for reporting Protein phosphorylation? 
Protein phosphorylation:  Protein phosphorylation was first reported in 1906 by Phoebus Levene at the Rockefeller Institute for Medical Research with the discovery of phosphorylated vitellin. Phoebus Levene: Phoebus Aaron Theodore Levene, M.D. (25 February 1869 – 6 September 1940) was an American biochemist who studied the structure and function of nucleic acids.
Phoebus Levene