Changes in circulating B cells and immunoglobulin classes and subclasses in a healthy aged population.
Paganelli R, Quinti I, Fagiolo U, Cossarizza A, Ortolani C, Guerra E, Sansoni P, Pucillo LP, Scala E, Cozzi E. Clin Exp Immunol. 1992 Nov; 90(2):351-4.