Abstract
Short-term IgM memory is established within 1 day after primary injection. This 1 day priming is independent of cell division as it can take place in the pressence of methotrexate or hydroxyurea. The primary response involves a similar 1 day nonproliferative phase. On the contrary, cells responding to a second injection of antigen after short priming intervals begin to proliferate within hours. This implies a qualitative difference between the antigen-sensitive cells in primed and normal animals. After 1 day, further proliferative expansion of memory can occur, which is probably antigen dependent. The response to several dose regimens indicates that repeated antigenic contact is needed to maintain the IgM response.
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