the tumor-promoting ester 4 beta-phorbol 12-myristate 13-acetate ( pma ) has been shown to induce the differentiation of the immature monocytelike cell line u-937 c in vitro into a heterogeneous population of cells , including small `` '' dense '' '' cells , large vacuolized or `` '' foamy '' '' cells , spindle-shaped cells , and cells with multiple filopodia ( `` '' stellate '' '' cells ) .
C0007589
the differentiation
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and c