The Rb1 gene has been implicated with retinoblastoma and is located on
human Chromosome (Chr) 13q14.2. A unique sequence human Rbl cosmid DN
A probe has been used to localize this region on apes' Chr 14 by the F
ISH technique. The conservation of the Rb] gene in higher primates at
the corresponding equivalent chromosome locus (14q14) of the human may
serve as a phylogenetic marker to further trace the evolutionary path
way of human descent.