OTX2 and infection: The high degree of correlation (R2=0.98; Fig. 7d) in the distribution of tectal-derived Sox14 neurons across the LGN subdomains that have been either labelled by Sox14Otx2 co-expression or by cre-dependent AAV infection, further supports the conclusion that double-positive Otx2+Sox14+ precursors reside in the dorsal midbrain before birth and migrate ventrally to seed the dLGN with local interneurons.