obsolete increased protein serine phosphorylation during nitrogen starvation true midori increased protein serine phosphorylation during nitrogen deprivation increased peptidyl-serine phosphorylation during nitrogen starvation This term was made obsolete to implement a decision that protein modification terms should only include residue-specific information in cases where it is especially biologically significant, such as in histones or the RNA polymerase II CTD. In all other cases, phenotypic effects on specific modified residues should be captured in annotation extensions. 2015-02-19T11:46:24Z OBSOLETE. A cellular process phenotype in which the phosphorylation of serine residues in one or more specific proteins, or of specific protein sites, occurs to a greater extent than normal when the cell is subject to nitrogen starvation. increased protein serine phosphorylation during cellular response to nitrogen starvation FYPO:0004421 increased serine phosphorylation during nitrogen starvation FYPO:0002681 increased protein serine phosphorylation during nitrogen depletion