Organogenesis is the phase of embryonic development that starts at the end of gastrulation and continues until birth.
[5] The mesoderm or middle germ layer of the embryo will form the blood, heart, kidney, muscles, and connective tissues.
[5] The ectoderm or outermost germ layer of the developing embryo forms epidermis, the brain, and the nervous system.
[1] Vertebrates develop a neural crest that differentiates into many structures, including bones, muscles, and components of the central nervous system.
In vitro and in response to specific cocktails of hormones (mainly auxins and cytokinins), most plant tissues can de-differentiate and form a mass of dividing totipotent stem cells called a callus.