I(1,3,4,5,6)P5 is dephosphorylated to I(3,4,5,6)P4 by ITPK1 in the cytosol

Inositol-tetrakisphosphate 1-kinase (ITPK1) dephosphorylates inositol 1,3,4,5,6-pentakisphosphate (I(1,3,4,5,6)P5) to inositol 3,4,5,6-tetrakisphosphate (I(3,4,5,6)P4) (Ho et al. 2002).

肌醇四磷酸1-激酶（ITPK1）通过去磷酸化肌醇1,3,4,5,6-五磷酸（I(1,3,4,5,6)P5）生成肌醇3,4,5,6-四磷酸（I(3,4,5,6)P4）（Ho 等人，2002年）。