Fig. 6

Comparison of the size distribution of SP-A in bronchoalveolar lavage (BAL) fluid from patients with birch pollen allergy during the high- and low-pollen seasons. Samples of BAL from 11 patients with an allergy to birch pollen were taken when there was no birch pollen (low season, February) and when birch pollen was at higher levels (high season, May–July). The average relative amount of SP-A in each form, as determined by gel filtration, is shown for the two seasons. Division of the gel filtration profile into species named hexamer, tetramer, dimer, and polypeptide is as stated in the legend to Figure 2.