"Ohhhh. So you mean you were confused, too - I understand now." Her mind had been about one degree behind. But then, with a smile, she nodded. "Of course I'm part of a body. I'm a red blood cell," she said, easily agreeing with that. "And my friends are other red blood cells, white blood cells, the cute little platelets... I don't think I'd be brave enough to call the macrophages or the killer Ts my friends, but yeah, I know them, too."

That smile of hers remained through the whole thing. She'd been one of the first red blood cells to make friends with the immune cells. That was changing, bit by bit, and she was glad.