Abbott IMx AFP Calibrators, list 2271-01; a box of 6 bottles (4 mL each) with AFP (human), nonreactive for anti-HIV-1/HIV-2 and HCV and nonreactive for HBsAg, inbuffered calf serum at the following concentrations: A - 0, B - 15, C - 50, D - 100, E - 200 and F - 350; Abbott Diagnostics, a Division of Abbott Laboratories, Abbott park, IL 60064