In collaboration with the College of Veterinary Medicine, Vienna University, Austria, Assiut University held an enlarged workshop organized by the Molecular Biology Unit and lasted for three days. The workshop was concerned with the implantation of mammal tissues and their usage in research. Besides, the workshop included a number of lectures and practical lessons on all medical fields; medicine, veterinary medicine, science, and pharmaceutical fields. The workshop emphasized the scientific endeavor to prove that the usage of implanting and usage of tissues are far better than using experimental animals.