(A) Sequences of B. malayi ALT-1 (U57547) and ALT-2 (U84723) compared to W. bancrofti ALT-1 (AF084553; R. Sabarinathan and P. Kalikraj, Anna University, Madras, India, unpublished) and C. elegans cosmid CO8A9. Alignments with D. immitis and O. volvulus have been published previously (13, 15). Note that the intron position in W. bancrofti has not been determined. (B) Evidence for expression of the C. elegans alt homologue, a 240-bp PCR product representing cDNA from mixed-stage C. elegans. Note the 289-bp band representing genomic DNA.