I'm trying to plan a QTL on two species of C. elegans, and I need to first identify SNP differences between the two strains (AB1, and N2). Does anyone know what databases contain these SNP libraries, and how I would go about comparing them, defining avg. marker spacing of SNPs, median marker spacing, highs and lows. I've just started working in worms, and I'm totally unfamiliar with the resources available. Sorry if this is a naive question.