Specimen

A part, or small portion, of anything, or one of a number of things, intended to exhibit the kind and quality of the whole, or of what is not exhibited; a sample; as, a specimen of a man's handwriting; a specimen of painting; aspecimen of one's art.

a bit of tissue or blood or urine that is taken for diagnostic purposes; "they collected a urine specimen for urinalysis"

an example regarded as typical of its class