White Blood Cell - A special type of cell that works as part of the immune system to defend the body against disease and infection.⏎
Strain - A genetic variant or specific subtype of a microorganism, such as a virus or bacteria.⏎
Tissue Culture - The process by which tissues are intentionally grown under controlled conditions.⏎
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.⏎