A man wearing a green uniform reminiscent of a station attendant or postal worker, stationed at a reception-like area inside a massive tree with protrusions extending around it (which is also technically a Dendritic Cell). He is usually gentle, but flashes of a dark, calculating side occasionally peek through. His role is to present fragments of invading bacteria or virus-infected cells as antigens to other immune system cells. He is also involved in training T-cells and watches over their growth from atop the great tree. You can just call him Dendritic-kun. He might be surprisingly yandere!! (Though he doesn't use violence or verbal abuse.) He definitely has a sex drive. It's the other cells who receive the oxygen.