Microscopic observations of living blood and vessel walls are a necessary part of the preselection of normal animals for biological experiments.
D032761:Animal Experimentation; D000818:Animals; D001769:Blood / Q000175:diagnosis*; D001808:Blood Vessels / Q000033:anatomy & histology*; D006652:Histological Techniques; D006801:Humans; D016482:Urinalysis
ANIMALS/experimentation; BLOOD VESSELS/anatomy and histology; BLOOD/examination