Proteinaceous Plug

**Semantic type:** Body Substance

**Definition:** A loosely organized mass found in the bladder and/or urethra of male rats, composed of eosinophilic material intermingled with exfoliated urothelial cells, and occasionally containing spermatozoa. Plug formation is assumed to be a result of abnormal ejaculation and secretions from the male accessory sex glands, and may occur during euthanasia.

**Synonyms:** - PROTEINACEOUS PLUG - Seminal Plug