Question: Natural Treg cells ( nTregs ) develop in the thymus in response to which of the following? Weak stimulation by self - antigens that is

Natural Treg cells (nTregs) develop in the thymus in response to which of the following?
Weak stimulation by self-antigens that is not sufficient to cause deletion
Weak stimulation by self-antigens that is sufficient to cause deletion
Strong stimulation by self-antigens that is sufficient to cause deletion
Strong stimulation by self-antigens that is not sufficient to cause deletion

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