👉 In the context of biology, intergration refers to the process by which cells of different species integrate or combine in a way that allows for communication and exchange of genetic material. Intergration can occur through a variety of mechanisms such as cell-to-cell contact, transduction, fusion, and gene transfer. For example, in the case of human leukocyte antigen (HLA) molecules, they are found on the surface of red blood cells and other immune cells. When these cells come into contact