Template:Ref-Ingalls1929
From Embryology
Ingalls NM. Symmetrical, segmental thickenings in the dorsal ectoderm of human embryos. (1929) Amer. J Anat. 44(3): 455-473.
Ingalls NM. Symmetrical, segmental thickenings in the dorsal ectoderm of human embryos. (1929) Amer. J Anat. 44(3): 455-473.