Fig. 3.

Presence of SAα2,6-gal in ciliated cells of the respiratory tract of quail. Three similar sections of quail trachea were stained to detect the presence of either SAα2,3-gal (A), SAα2,6-gal (B) or β-tubulin, a marker for ciliated cells (C) as described in Materials and methods. The staining shows the abundant presence of SAα2,3-gal receptors in mucin-producing, nonciliated cells. The SAα2,6-gal receptor expression matches the expression pattern of β-tubulin in ciliated cells.