(pal´is-tәr kil´e-әn) a rare syndrome of mosaicism in which only the fibroblasts are aneuploid, having 47 chromosomes instead of 46. This results in mental retardation, seizures, streaks of discoloration on the skin, various facial anomalies, and less often defects of limbs, heart, or other structures. Called also tetrasomy 12p.
