http://kidshealth.org/teen/your_body/body_basics/immune.html#
http://www.s-cool.co.uk/a-level/biology/immunity/revise-it/the-third-line-of-defence
Ms Hantzis's powerpoints
BIOLOGY 12 A Student Study Guide - Stephen Gloury
Nelson Biology Units 3 & 4 textbook
http://www.s-cool.co.uk/a-level/biology/immunity/revise-it/the-third-line-of-defence
Ms Hantzis's powerpoints
BIOLOGY 12 A Student Study Guide - Stephen Gloury
Nelson Biology Units 3 & 4 textbook