Wheal and flare responses in a patient skin tested with the cat allergen and cat allergen mixed with AS, as in Figure 1. Histamine and saline were included as controls. Reactions were read with no testing (A), 5 min (B), 15 min (C), and 30 min (D). Within each panel, skin prick responses are shown to: histamine (1), saline (2), 10% saline + 90% cat allergen (3), cat allergen (4), and 10% ASβ + 90% cat allergen (5). Wheals were measure by the aid of skin test calipers.