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How We Get Our Skin Color

This animation describes how skin color is generated by skin cells as protection against ultraviolet (UV) radiation.

Cell Biology
Anatomy & Physiology
Animations
High School — General
High School — AP/IB
College
How Tumors Grow

This animation shows how a tumor forms, recruits blood vessels, and enters metastasis.

Cell Biology
Animations
High School — AP/IB
College