Abstract
A study of the deoxyribonucleic acids present in the testes of species from nine genera of crustaceans, representing the sub-groups Malacostraca and Cirripedia, has been carried out using the techniques of density-gradient centrifugation in cesium chloride and thermal denaturation. Only one genus, Cancer, has DNA containing a minor component very rich in adenine and thymine. All species of this genus so far examined contain the unusual DNA as either about 30 or 10% of the total DNA isolated. The DNA of a barnacle, Balanus nubilis, contains a minor component which is relatively rich in guanine and cytosine.
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