KaryotypeAll of the chromosomes in a cell or an individual organism, visible through a microsope during cell division.
KeratinAn extremely tough protein substance found in hair, nails, skin, and cornea.
KeratinocytesCells that synthesize keratin and are found in the skin, hair, and nails. A fibrous protein is produced by keratinocytes and may be hard or soft.
Knock-out mouseA mouse that has had one or both copies of a specific gene deleted or inactivated.