Cell that produces antibodies during an organism’s first and subsequent exposures to a particular antigen.

B cells

Explanation:

Antibodies are produced by a type of white blood cell (lymphocyte) called B cells. Each B cell can only produce antibodies against one specific epitope. When activated, a B cell will multiply to produce more clones able secrete that particular antibody.

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when comparing the cases, what similarities are there in the cases that suggest one person committed these murders?