A variety of experimental approaches have underscored the critical role played by secreted
polypeptide factors, such as those encoded by members of the Wnt gene family, in many …

Abstract ANANDAMIDE (N-arachidonoyl-ethanolamine) was recently identified as a brain
arachidonate derivative that binds to and activates cannabinoid receptors1–4, yet the …

THE pattern of skeletal structures and muscles in the branchial region of the head is
profoundly influenced by the neural crest1, whose cells arise at discrete segmental levels of …

In this study we have cloned the chick Hoxa-2 gene and analysed its expression during
early development. We find that Hoxa-2 has a rostral limit of expression in the …

During the development of the vertebrate head, cranial neural crest cells migrate into the
branchial arches to form many of the structures of the facial skeleton. These cells follow …

ABSTRACT kreisler is a recessive mutation resulting in gross malformation of the inner ear
of homozygous mice. The defects in the inner ear are related to abnormalities in the …

Pattern formation in the hindbrain involves a segmentation process leading to the formation
of metameric units, manifested as successive swellings known as rhombomeres (r). In …

The spatiotemporal distribution of cell death in the chick embryo neural tube and spinal cord
(brachial region) was examined between stage (St.) 12 and 22, in plastic semithin sections …

Msx2, a member of the highly conserved and widely distributed msh homeobox gene family,
is expressed in a variety of sites in the vertebrate embryo, including craniofacial structures …

Hindbrain neural crest cells adjacent to rhombomeres 2 (r2), r4 and r6 migrate in a
segmental pattern, toward the first, second and third branchial arches, respectively. Although …