The document discusses research examining potential substructure within the rat dorsal lateral geniculate nucleus (dLGN). The researcher is using tracing and imaging methods to analyze retinal projections to the dLGN in an attempt to identify distinct regions defined by anatomical and cellular criteria. Initial analyses include tracing ipsilateral and contralateral projections in the dLGN and examining cytoarchitecture to look for differences in cell properties across regions. The goal is to determine if the rat dLGN contains distinct sublaminae like those found in other species.