This term is obsolete.
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Definition:
OBSOLETE. Any process that increases the frequency, rate or extent of the catalysis of the reaction: ATP + 1-phosphatidyl-1D-myo-inositol 4-phosphate = ADP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate.
Comment:
This term was obsoleted because it represents a molecular function.