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Uncultivable for more than 25 years, the sex-ratio spiroplasma of Drosophila willistoni grew in a tissue culture medium (H-2) containing an embryo-derived lepidopteran cell line (IPLB-TN-R(2)). After adaptation, it grew in a cell-free H-2 medium. This success demonstrates the usefulness of cell culture systems for cultivation of fastidious microorganisms and facilitates study of the sex-ratio trait in Drosophila.
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Hackett et al. (1986) studied this question.
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