Bacillus DNA in fossil bees: an ancient symbiosis? Cano, R. J. ; Borucki, M. K. ; Higby-Schweitzer, M. ; Poinar, H. N. ; Poinar, G. O., Jr. ; Pollard, K. J. Abstract Publication: Applied and Environmental Microbiology Pub Date: June 1994 DOI: 10.1128/aem.60.6.2164-2167.1994 Bibcode: 1994ApEnM..60.2164C