tetracoccus mascot style with grinning face

anatomy bacteria bacterial bacterium cartoon character cheerful cute design emoticon emotion expression funny glow grin happiness happy icon illustration lab laboratory laugh mascot microscope mug organism pathogenic pneumonia prokaryotic pyogenes research sarcinia science shine simper smile smiley smirk smirking staphylococci staphylococcus streptococci streptococcus structure style system tetracoccus tetrad vector vibrio