Complex sentence: The MHB expresses signaling molecules that regulate the differentiation and patterning of the adjacent neuroepithelium, allowing for the development of the midbrain and hindbrain, and the specification of neuronal subtypes in these regions.
Split into simpler sentences: The MHB expresses signaling molecules that regulate the differentiation and patterning of the adjacent neuroepithelium. This allows for the development of the midbrain and hindbrain as well as the specification of neuronal subtypes in these regions.