Phosphorylated to a less than normal extent, or less than fully(adjective)
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Use "hypophosphorylated" in a sentence
"This hypophosphorylated form of Rb is now capable of binding to E2F family members, resulting in suppression of their transcriptional transactivation potential during early G"
"Concurrent with this timeframe, the Rb protein is hypophosphorylated and MCMs have not loaded onto chromatin at the preRCs."
"Moreover, the ZAK-RhoGDIbetainteraction may maintain ZAK in an inactive hypophosphorylated form."