. "\"Any process that activates or increases the frequency, rate or extent of the phosphorylation of peptidyl-tyrosine.\" [GOC:ai]" . . "positive regulation of peptidyl-tyrosine phosphorylation" . "up regulation of peptidyl-tyrosine phosphorylation" . "up-regulation of peptidyl-tyrosine phosphorylation" . "upregulation of peptidyl-tyrosine phosphorylation" . . . "activation of peptidyl-tyrosine phosphorylation" . "stimulation of peptidyl-tyrosine phosphorylation" .