Abstract
1. 1. The tegumental spines of Fasciola hepatica have been isolated. 2. 2. Acid hydrolysates of total spines revealed a lack of detectable cystine and 3-methylhistidine. 3. 3. SDS completely solubilized the spines, the subsequent gel-electrophoresis resolved several minor polypeptide components and a major one of approx. 50,000 mol. wt. 4. 4. These results suggest an infrastructural difference between digenean spines and their counterparts in the con-phyletic cestodes. 5. 5. The results do not support the view that digenean spines are largely composed of actin.
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