Among the retinal genes during chick myopia progression overlapping with human myopia genes in retina, EHPA2 encodes one of the Eph receptors, a large family of receptor tyrosine kinases that mediate many processes, such as cell-to-cell communication and cell attachment [94], as well as several phosphodiesterases and DJD2, a gap junction gene [82]. The gene discussed is NTRK1; the disease is myopia.