Harada T, Hamaguchi Y, Sakakura Y, Miyoshi Y
Acta Otolaryngol. 1984 Mar-Apr;97(3-4):359-62. doi: 10.3109/00016488409131000.
In normal subjects the concentration ratio of secretory IgA (sIgA) to total IgA in nasal secretion was measured by means of enzyme-linked immunosorbent assays (ELISA). No marked circadian variation was disclosed in the sIgA/IgA ratio in nasal secretion.