mascot concept of tetracoccus proudly wearing a black graduation hat

alumnus anatomy bacteria bacterial bacterium cartoon character cheerful cute design education emoticon emotion expire expression finish funny graduate graduated graduation happy hat icon illustration lab laboratory mascot microscope organism pathogenic pneumonia prokaryotic pyogenes research sarcinia science smart smile staphylococci staphylococcus streptococci streptococcus structure student style system tetracoccus tetrad vector vibrio