DUSP6 and keratoconus: We examined Dusp6 mRNA levels in tumor sections obtained from LSL-KrasG12D/+, Ptf1aCre/+ (KC), LSL-KrasG12D/+, Tp53R172H/+, Ptf1aCre/+ (KPC) mice, co-stained for either Krt19 (a tumor epithelial cell marker) or Pdgfrb (a stromal marker).