2) A beautiful aspect of the stickleback system is the globally replicated divergence of numerous phenotypes. Identifying additional loci for these quantitative traits in different populations, and drawing general conlcusions about the interactions of development during stickleback evolution, will require the development of new tools and techniques for examining gene expression on global scales, and examine numerous genetic markers simultaneously. To make this possible, the Cresko and Johnson laboratories have produced the first microarray resouces for stickleback, and are pushing to make expression and simple nucleotide polymorphism (SNP) genotyping arrays available at low cost to the stickleback community.