皮肤的免疫
皮肤是人体抵御微生物致病体内入侵人体的主要屏障。皮肤免疫细胞中多种功能性亚结构能感知感染以及各级屏障的破坏并做出应答以激活免疫应答，最终达到体内平衡。然而，免疫应答的调控解除也会引发如牛皮癣的皮肤疾病。
头足纲动物的可变化的皮肤细胞 - Roger Hanlon P3
本视频由科普中国和生物医学大讲堂出品
Roger Hanlon (MBL) Part 3: Changeable Skin
Hanlon introduces the amazing adaptive coloration of cephalopods. He uses video and still photography to showcase their ability to rapidly change color, pattern and skin texture with fine control and a diversity of appearances, to produce camouflage or to send signals. He argues that all camouflage patterns in nature can be grouped into three types. In part 2, Hanlon shows us results from his lab that make a convincing case that the rapid adaptive coloration of cephalopods is controlled by their visual system; quite impressive for a color-blind animal! Part 3 focuses on the unique skin of cephalopods including the system of pigments and reflectors that allows it to quickly change to any hue and contrast, and the papillae musculature that allows the skin to deform and create multiple 3D textures.