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Sun 10 Oct, 2010 08:44 pm
Context:
Memory B cells are essential for the long-lived immunity that arises after immunisation. To develop into memory cells, B cells have to survive the natural process of apoptosis, or programmed cell death, that occurs following a large immune response.
@Merry Andrew,
that means which
or leave out that and use occurring
@laughoutlood,
Or leave it as it is. It's perfectly comprehensible to any English-speaker.