Selfish (cheater) genotypes are expected to increase within populations, a trait that benefits the group would have to evolve by selection among groups, rather than by selection among individual organisms within the groups.

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#Id: 10344

#XL - Q Biochemistry

B- cell maturation

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#Id: 10345

#XL - Q Biochemistry

T1 and T2 Transitional B Cells

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#XL - Q Biochemistry

T1 cells are mIgMhi, mIgD -/lo, CD21-, CD23-, CD24+, and CD93+. 

T2 cells differ from T1 cells in having higher levels of mIgD and in expressing CD21 and CD23. 

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#Id: 10347

#XL - Q Biochemistry

Transitional B cells bound for a follicular fate undergo positive and negative selection in the spleen.

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#Id: 10348

#XL - Q Biochemistry

BAFF-R expression is first detected in T1 B cells and increases steadily there after.

Signaling through the BAFF/BAFF-R axis promotes survival of transitional B cells by inducing the synthesis of anti-apoptotic factors such as Bcl-2, Bcl-xl, and Mcl-1

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#Id: 10349

#XL - Q Biochemistry