Parra M, Herrera D, Calvo-Calle JM, Stern LJ, Parra-L?pez CA, Butcher E, Franco M, Angel J. Circulating human rotavirus specific CD4 T cells identified with a class II tetramer express the intestinal homing receptors a4?7 and CCR9. Virology. 2014 Mar; 452-453:191-201.