title: Determination of heart polarity (arterio venous axis) in the chicken embryo.
authors.affiliation: Department of Anatomy, Medical School, University of Madrid, Spain.
authors.forename: Francisco Orts
authors.initials: FO
authors.lastname: Llorca
authors.affiliation: Department of Anatomy, Medical School, University of Madrid, Spain.
authors.forename: Juan Jimenez
authors.initials: JJ
authors.lastname: Collado