Richard hypothesis 

d/w = resource separation ratio.

d/w < 1, species cannot coexist;

1 < d/w < 3, there will be some competition between species

d/w > 3, species coexist harmoniously

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B cell Development

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The heavy chain is then expressed on the cell surface in combination with the surrogate light chain, which is made up of VpreB and λ5. 

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B- cell maturation

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T1 and T2 Transitional B Cells