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From the website: "a freely accessible, easy-to-search, public repository of reviewed and annotated images, videos, and animations of cells from a variety of organisms, showcasing cell architecture, intracellular functionalities, and both normal and abnormal processes."
From the website: "free on-line tools to identify species, share ways to teach and study nature's wonders, report findings, build maps, process images, and contribute to and learn from a growing, interactive encyclopedia of life that now has 1,148,969 species pages"
Scitable is a free science library and personal learning tool by Nature Publishing Group. Scitable concentrates on genetics and cell biology, including evolution, gene expression, andf cellular processes shared by living organisms.