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Bacillus DNA in fossil bees: an ancient symbiosis?
Cano RJ, Borucki MK, Higby-Schweitzer M, Poinar HN, Poinar GO Jr, Pollard KJ. Cano RJ, et al. Appl Environ Microbiol. 1994 Jun;60(6):2164-7. doi: 10.1128/aem.60.6.2164-2167.1994. Appl Environ Microbiol. 1994. PMID: 8031102 Free PMC article.