CXCR4 acts as a costimulator during thymic beta-selection.
Trampont PC; Tosello-Trampont AC; Shen Y; Duley AK; Sutherland AE; Bender TP; Littman DR; Ravichandran KS; Nature Immunology, 2010, vol. 11, issue 2, p 162, ISSN 15292916. ISBN 15292916.
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