The ror receptors are a highly conserved family of receptor tyrosine kinases genetically
implicated in the establishment of cellular polarity. We have cloned a ror receptor from the
marine mollusk Aplysia californica. Aplysia ror (Apror) is expressed in most developing
neurons and some adult neuronal populations, including the neuroendocrine bag-cell
neurons. The Apror protein is present in peripheral neuronal processes and ganglionic
neuropil, implicating the kinase in the regulation of growth and/or synaptic events. In …