“…In contrast to tonsils, however, the anlage of which appears at the same fetal age as that of PPs (von Gaudecker and Müller-Hermelink, 1982), the organogenesis of murine NALT begins after birth, like murine ILFs (Kunisawa et al, 2008). Like murine BALT (Moyron-Quiroz et al, 2004), human BALT and nasal ILFs also seem to be inducible because these structures show large individual variability in their appearance (Tschering and Pabst, 2000;Debertin et al, 2003;Heier et al, 2008Heier et al, , 2011.…”