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The bodies hird line of defense (beyond barriers like the skin and mucus) is the cellular immune response. This is where your bodies cells attack antigens (foreign molecules in your body). Many different types of cells are involved in his, but the most important are HUMORAL cells like MACROPHAGES, which basically surround and digest antigens and B CELLS which produce antibodies which surround the antigen and allow it to be attacked quicker. The OTHER type of cells belong to the ADAPTIVE immune response, which includes B-CELL tha has evolved into a MEMORY cell. These cells remember what the antigen looks like (for instance a specific virus) so that the next time it comes around the cells can make antibodies to atack it.

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