SECTION 31.2 IMMUNE SYSTEM Power Notes The immune system is: Part How It Contributes to the Immune System Skin Mucous membrane Circulatory system Phagocyte T cell B cell Antibody Interferon Passive Immunity Active Immunity Both Unit 9 Resource Book Power Notes 97 McDougal Littell Biology C op yr ig ht ? M cD ou ga lL itt el l/H ou gh to n M iff lin C om pa ny . CH A PTER 31 Im m une System and Disease
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