V?9:V?2 T cells differ from ?:? T cells in that they _____. (Select all that apply.)
a. respond to phosphorylated metabolic intermediates (phosphoantigens) of isoprenoid biosynthesis pathways
b. bind to lipid antigens presented by CD1
c. do not carry out gene rearrangement
d. are not subject to positive and negative selection in the thymus
e. have limited diversity of V gene rearrangement.
a, d, e
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