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Chromosomal DNA from Streptococcus mutans strain MFe28 (serotype h) was cloned in the bacteriophage vector lambda L47.1. Two classes of recombinants were found which expressed glucosyltransferase activity in phage plaques: (i) gtfS, which expressed a glucosyltransferase synthesizing a water-soluble, dextranase-sensitive glucan, and (ii) gtfI, which expressed a primer-dependent glucosyltransferase synthesizing an insoluble glucan.
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Gilpin et al. (1985) studied this question.
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