title: The STEM: an attractive tool for the biologist.
mesh_terms: D000818:Animals; D001407:Bacillus / Q000648:ultrastructure; D001695:Biology; D003090:Coliphages / Q000648:ultrastructure; D004926:Escherichia coli / Q000648:ultrastructure; D005399:Fishes; D008297:Male; D008855:Microscopy, Electron, Scanning; D011479:Protamines; D011487:Protein Conformation; D013094:Spermatozoa / Q000648:ultrastructure; D014764:Viral Proteins
chemical_list: D011479:Protamines; D014764:Viral Proteins