text: p90 Rsk-1 is located at 1p.
  p90 Rsk-2 is located at Xp22.2 and contains 22 exons.  Mutations in this gene have been associated with Coffin–Lowry syndrome, a disease characterised by severe psychomotor retardation and other developmental abnormalities.
  p90 Rsk-3 is located at 6q27.