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agent analysis anatomical bacteria biological bones care cause cells clinic coccus diplococci diplococcus disease doctor enlarged flora foramen form glove gonococcus gonorrhea hand health hold hospital infection infectious join laboratory latin medical meningitis microbiologist microbiology microorganism model neisseria obturator obturatum orifice palm pathogenic pelvis pneumonia pointer points protection science scientist show streptococcus structure students study test treatment two visualization white