Tissue Culture - The process by which tissues are intentionally grown under controlled conditions.⏎
Virus - An infectious agent that is only capable of replicating itself inside the living cells of other organisms.⏎
Strain - A genetic variant or specific subtype of a microorganism, such as a virus or bacteria.⏎
Sperm Cell - The male gamete, or sex cell, which carries the hereditary material of the male parent and unites with the female egg cell during sexual reproduction.⏎
Species - One of the most basic units of biological classification, ranking just below the genus and comprising individuals or populations capable of interbreeding.⏎