More cells participate in this response than the in the primary response. The secondary response is more rapid and produces a greater amount of antibody. Moreover, the antibody concentration remains high for a much longer period. The main antibody produced during the secondary response is IgG. The secondary response is due to the activity of the B-lymphocytes (memory cells) stimulated during the primary response.
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Second, I failed to look at the population numbers for these zip codes, and as a result I included several that had tiny populationsâphantom zip codes really. That included Columbia (SC)âs 29202, Chicagoâs 60604, Roanokeâs 24011, and Dallasâs 75247, all of which had 2010 populations of less than 1,000.