Semantic Scholar : A unique and easy-to-use resource, Semantic Scholar harnesses the power of artificial intelligence to efficiently sort through millions of science-related papers based on your search terms. According to the site, although some articles are behind paywalls, "the data [they] have for those articles is limited," so you can expect to receive mostly full-text results. Another feature is the extensive advanced search options, which allow you to search by cell type and brain region, among other things.