Helper cells belong to -
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- T cells
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- Macrophages
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- B cells
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- Monocytes
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T-cells
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T cells are amongst the two important cells of adaptive immune system (others are B-cells).
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T cell precursors arise in bone marrow (also in yolk sac & liver before birth) and migrate to the thymus.
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Maturity of T-cells takes place in the thymus (So, T cells arise in bone marrow and mature in thymus).
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T-cells constitutes 60%-70% of the circulating peripheral lymphocytes.