Western blot of DICER1 protein using samples from HeLa cells transiently transfected with an expression plasmid for hAgo1 (A, upper), hAgo3 (A, bottom), the N-terminal 550 aa of hAgo2 (B, left), the C terminus of hAgo2 (B, right), or hAgo2 (1 to 830 aa) (C).