. "Any process that activates or increases the frequency, rate, or extent of myeloid leukocyte differentiation." . . . "positive regulation of myeloid leukocyte differentiation" . "activation of myeloid leukocyte differentiation" . "stimulation of myeloid leukocyte differentiation" . "up regulation of myeloid leukocyte differentiation" . "up-regulation of myeloid leukocyte differentiation" . "upregulation of myeloid leukocyte differentiation" . . . . . . . .