Assertion: anthrax's spore | /r/HasProperty | purified to different extents
Facets:
Source sentences:
text: An August 2006 article in Applied and Environmental Microbiology, written by Douglas Beecher of the FBI labs in Quantico, Virginia, states "Individuals familiar with the compositions of the powders in the letters have indicated that they were comprised simply of spores purified to different extents.