Atoms are characterised by:

Radius

Ionization energy

Electron affinity

Electronegativity

Metallic character

Oxidation potential

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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

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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.