Oblon, Fisher, Spivak, McClelland & Maier
Process for preparing L-threonine
 Disclosed is a process for preparing L-threonine which comprises causing D-threonine-aldolase, or D-threonine-aldolase and L-allothreonine-aldolase to act on a solution containing at least DL-threonine thereby obtaining L-threonine from a mixture containing at least DL-threonine. 
Denki Kagaku Kogyo Kabushiki Kaisha
C C
C12P C12N
inventional inventional
Hideaki Yoshiaki Iwao Haruo Masaaki Masahisa Teruzo Noriaki
Yamada Ishimatsu Kibayashi Gomi Kato Ikemi Miyoshi Koizumi