A mouse mammary tumor, adenocarcinoma BW 10232, was maintained in vitro for 14 days, separated from embryonic mammary mesenchyme by a Millipore filter. Tubules developed in the tumor; deoxyibonucleic acid synthisis declined; and a presumptive acid mucopolysaccharide matrix, not evident in the controls, appeared.
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DeCosse et al. (1973) studied this question.
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