B-lymphocyte aggregates in alveoli from a child with hypersensitivity pneumonitis (bird breeders lung). - McClellan JS; Albers GM; Noyes BE; Sotelo C; Petterchak JA; Knutsen AP (Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology, 1999)