00365nam a2200121Ia 4500008004100000020001400041100002900055245008000084260004300164300001000207942000700217999001900224251117s9999||||xx |||||||||||||| ||und||  a897662946  aSmith, George F.9110811 0aMolecular Structure of the Number 21 Chromosome and Down Syndrome Vol-450th  bThe New York Academy of Sciencesc1985  a250p.  cBK  c270386d270386