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Alkaline phosphatase activity expressed by the cells on poly[bis(ethyl alanato) phosphazene] [PNEA], poly[(50% ethyl alanato) (50% methyl phenoxy) phosphazene] [PNEA50mPh50], poly[(50% ethyl alanato) (50% phenyl phenoxy) phosphazene] [PNEA50PhPh50], and tissue culture polystyrene [TCPS] over 7 days. Statistical significance at p<0.05, n=4.
