Answers are grounded in this paper and cite their sources.
Strains of killer yeasts of various genera from a variety of sources were tested for their ability to kill each other, two neutral strains and four classes of mutants isolated as being resistant to killer toxin from a stock killer strain k12-1. The strains tested fell into four groups designated TOX1 to TOX4 according to their killing/immunity reaction with one another and their ability to kill the resistant mutants.
No takes yet. Share an insight, caveat, or question.
Rogers et al. (1978) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: