Universidad de Cantabria 1 article published in JoVE Developmental Biology Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation Jessica Cristina Marín-Llera1, Montse Fernández-Calderón2, Jesús Chimal-Monroy1 1Departamento de Medicina Genómica y Toxicología Ambiental, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, 2Departamento de Anatomía y Biología Celular and IDIVAL, Facultad de Medicina, Universidad de Cantabria Recombinant limbs are a powerful experimental model that allows for studying the process of cell differentiation and the generation of patterns under the influence of embryonic signals. This protocol presents a detailed method for generating recombinant limbs with chicken limb-mesodermal cells, adaptable to other cell types obtained from different organisms.