label: Reduced hepatic phosphorylase kinase activity
label_lc: reduced hepatic phosphorylase kinase activity
description: "Activity of phosphorylase kinase in liver tissue below the lower limit of normal. Phosphorylase kinase (PhK) has a major regulatory role in the breakdown of glycogen. The enzyme PhK comprises four copies each of four subunits, encoded by PHKA1, PHKA2, PHKB, and PHKG."