While this difference may be significant, it could also have been due to chance 632 SPIROCHETES AND FILTRABLE VIRUSES IN :FROZEN STATE alone.
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PROLONGED MAINTENANCE OF SPIROCHETES AND FILTRABLE VIRUSES IN THE FROZEN STATE.
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While this difference may be significant, it could also have been due to chance 632 SPIROCHETES AND FILTRABLE VIRUSES IN :FROZEN STATE alone.