三染色体性

正常人和21三体征家庭的银染核仁形成区的研究

trisomy 18 syndrome

trisomy 21 syndrome

21-trisomy(Downs syndrome)

trisomy 18 syndrome, Edwards' syndrome

trisomy 13 syndrome, Patau's syndrome

trisomy 22 syndrome

Down's syndrome, trisomy 21 syndrome

trisomy 20 syndrome