Ragweed antigens bind ragweed and then bind mast cells which release histamine
<span>Allergies develop because of a Th2 response against the allergen. </span>
When a muscle contracts, a bone will move. When a bone contracts, a muscle will move. ... When a ligament contracts, a tendon will move.
<span>Archaea are thought to have diverged from some ancient group of _______ bacteria<span><span><span> </span> gram-positive</span></span></span>
