複選題
14. Post-translational modifications of proteins regulate signal transduction in cells in response to difticrent stimuli.
Among different modifications, phosphorylation is one of the well charact terized events. Please indicate which
amino acids can be phosphorylated upon stimulation.
(A) Proline
(B) Serine
(C) Tyrosine
(D) Threonine
(E) Glutamine