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Plaques obtained on monolayers by the method described here after staining with 0.1% crystal violet (a.1 and b.1) and the corresponding hybridized plaques (plaques hybridized on a cellulose nitrate membrane filter [a.2] and plaques hybridized on a Hybond N+ membrane after transfer [b.2]). The images were scanned with an Epson model GT 9500 scanner, treated by using Adobe Photoshop 4.0, and printed with a Sony model UP-D8800 printer.
