... Occasionally the North American species, A. atropurpurea,isusedinthesamewayasA. archan-gelica. Other names for Western Angelica areEuropean angelica, garden angelica, purple angelica,Alexander’s archangel, ... onwhich of the amino acid chains is affected. (Hemo-globin is composed of four chains of amino acids.) Inalpha-thalassemia, there is an imbalance in the pro-duction of the alpha chain of am ino aci ... med-ical attention and learning the pattern of their angina,such as what causes the attacks, what they feellike, how long episodes usually last, and whether med-ication relieves the attacks....