Detection of MEG expression using microarrays. Expression of MEG transcripts detected by hybridization of double-stranded cDNA from intramolluscan germ balls, infective cercariae and day 3 skin-stage schistosomula, to a genome-wide oligonucleotide array. Fold differences in level of expression are plotted relative to the lowest value, irrespective of stage, which is taken as unity. The triple bar groups are arranged by the stage in which highest expression was found and by their MEG family.