The Chromosome Number of Echinococcus granulosus

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Abstract
The small size of the chromosomes makes accurate counting difficult. Protoscolices were cultured in 10% beef embryo extract in hydatid fluid followed by colchicine treatment to increase the number of somatic mitoses. Aceto-orcein staining after hypotonic treatment gave the best results. The chromosome number 18 diploid, the largest pair being just over 1 u in length. A reliable idiogram could not be derived but there appears to be one large open "U" in the haploid set of nine.

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