Chicken embryo is a widely used medium for the initial isolation and propagation of viruses and the production of vaccines. Chick Embryo Fibroblast Medium is a proprietary formulation specially developed to culture chicken embryo fibroblast cells. AT168 is Chick Embryo Fibroblast Medium with LGlutamine. Chicken embryo is a widely used medium for the initial isolation and propagation of viruses and the production of vaccines. Chick Embryo Fibroblast Medium is a proprietary formulation specially developed to culture chicken embryo fibroblast cells. AT168 is Chick Embryo Fibroblast Medium with LGlutamine.