May be involved in the negative regulation of skeletal muscle differentiation, independently of its glycerophosphocholine phosphodiesterase activity. H2O + sn-glycerol 3-phosphocholine = choline + H(+) + sn-glycerol 3-phosphate No significant reactions when glycerophosphoglycerol, glycerophosphoinositol and glycerophosphoserine are used as substrates. Widely expressed with highest levels in skeletal muscle and heart. Down-regulated in skeletal muscles atrophies, including atrophies linked to aging and denervation. Belongs to the glycerophosphoryl diester phosphodiesterase family. Extended N-terminus. Truncated N-terminus. Truncated N-terminus. Extended N-terminus.