... the Soret band, around 400 nm (short visible), and to a lesser extent in the Chapter 057. Photosensitivity and Other Reactions to Light (Part 2) Molecular Targets for UVR-Induced Skin Effects ... factor, prostaglandin E2, and tumor necrosis factor α. Local accumulation of these cytokines occurs in sunburned skin, providing chemotactic factors that attract neutrophils and macrophages. ... (Chap. 3 52), increased amounts are released into the circulation from the bone marrow and the liver and are transported to the skin, where they absorb incident energy both in the Soret band, around...