Abstract
1. 1. Amino acids are produced in the hydrolysis of human dander among which are: cystine, histamine and histadine. 2. 2. Physiologically the extractable substance in human dander is the same as dilute solutions of histamine. 3. 3. Fifty patients were tested intradermally with solutions of different strengths of histamine and human dander extracts and the skin tests elicited were in agreement. 4. 4. Chemically, the extractable substance in human dander gives, after the technic of Zimmerman, a color which is considered as being the specific color reaction for histamine.
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