The effect of asymmetric acyl chains in C1/C2 positions of glycerol backbone on the L_β–L_α main phase transition temperature (in Celsius) of phosphatidylcholine (data from Handbook of Lipid Bilayers, 2nd edn, 2013 (ref. 98)). Glycerophospholipids with longer sn-2 than sn-1 acyl chain have higher T_m values (blue) than those lipids with longer sn-1 acyl chain than sn-2 (grey).