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Autoregulation of germ tube formation by Candida albicans.

ABSTRACT

Germ tube formation by Candida albicans is at least partially controlled by a product(s) of the yeast phase of the organism which is released from cells upon incubation at 37 degrees C in tissue culture medium or fetal calf serum. This germination regulatory substance is stable under conditions of lyophilization and heating of 70 degrees C, but becomes inactivated at pH values of 4.0 and 9.5. A germination regulatory substance was produced by both strains of C. albicans tested and by a strain of C. tropicalis. Production does not appear to be a universal characteristic of yeasts because the factor could not be recovered from either Cryptococcus laurentii or Candida parapsilosis. Previously described C. albicans germination inhibitors such as cysteine, tryptophol, and phenylethyl alcohol appear not to be the substance described here. Because of the ability of the factor to influence C. albicans morphology, we have designated it morphogenic autoregulatory substance.

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