Southern blot of genomic DNA from different geographic isolates of A. gambiae (A) and other species of the A. gambiae complex (B) probed with the AgY477 satellite monomer. GAM, A. gambiae; ARA, A. arabiensis; MEL, A. melas; MER, A. merus; QUA, A. quadriannulatus. Bands corresponding to monomers and dimers of the AgX367 and AgY477 satellite DNAs are marked with arrows and their respective sizes are given.