Only a slight trend toward a lower STAT5 phosphorylation was observed in PHA stimulated cells after Tofa treatment, while STAT6 phosphorylation didn't show appreciable changes.
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The sentences
In contrast, the only STAT protein that showed a trend increase in phosphorylation after the second period of incubation was STAT3, suggesting a possible role of JAK1-STAT3 pathway in the proliferation rebound observed after withdrawal of the drug.