The amount of a DNA-directed RNA polymerases I, II, and III subunit RPABC2 (human) when measured in blood. The trait is amount of DNA-directed RNA polymerases I, II, and III subunit RPABC2 (human) in blood (OBA_2052845). Also known as: blood DNA-directed RNA polymerases I, II, and III subunit RPABC2 (human) amount.