ཌ་འུན་རྟགས་འདུས།
biol. A clinical condition of humans caused by an extra copy of chromosome 21 (trisomy 21) named after the physician (John) Langdon Haydon Down (1828-96), who made the first detailed […]
biol. A clinical condition of humans caused by an extra copy of chromosome 21 (trisomy 21) named after the physician (John) Langdon Haydon Down (1828-96), who made the first detailed […]