Differentiation of the epiblastic part of chick Hensen's node in coelomic cavity.

When implanted into the coelomic cavity the epiblastic, non-invaginated part of Hensen's node of chick blastoderm at Hamburger--Hamilton stage 3 to 3+ can differentiate into various tissues. These include neural, mesodermal, and endodermal ones, which are not essentially different from those derived from a complete node in similar conditions.