* heart/circulatory system
    * NT: peristattic heart
    * using PATO tubular for tubes (previous: cylindrical)
    * NT: dorsal vessel
    * NTs: primary and accessory circ. organs
 * NT: nematode pharynx
 * More taxon constraints - some vertebrate structures broadened to Craniata
 * Adding present_in for hagfish structures
 * NT: pineal complex (obsoleted previous ext term)
     * added pineal gland, parietal organ and NT paraparietal
 * Made text defs for cartilage elements more consistent (s/cartilage condensation/cartilage/element)
 * NT: lower part of vagina
new
using bounding_layer_of in places for surrounds for many structures
heart mesoderm