00346nam a2200121Ia 4500008004100000022001400041040001100055100002800066245001200094260009100106300001600197300001100213251112s9999||||xx |||||||||||||| ||und||  a0036-8075  aCNCLSA  aDaniel E. Koshland, Jr. 0aScience  cFebruary 21, 1992bThe American Association for the Advancement of ScienceaWashington  aP. 893-1808  bV. 255