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FIG. 1. Sectored colonies from Staphylococcus aureus strain PCI209P, appearing after 72 hr incubation at 37 C on Penassay seed agar. The darker portions correspond to the orange pigmented sectors. a) Colony which shows more than half pigmented sector. Magnification, 12 diameters. b) The most frequent type of sectored colony encountered, showing sectors of different hue. Note that the sectors are not convergent. Magnification, 15 diameters. c) Same as lb but at a magnification of 12 diameters. d) Another type of sectored colony. The sectors are but narrow pigmented strips, not converging. Magnification, 12 diameters. 316 [VOL. 82

SPONTANEOUS APPEARANCE OF SECTORED COLONIES IN STAPHYLOCOCCUS AUREUS CULTURES