Process for producing L-threonine by fermentation
 Microorganisms belonging to the genus Providencia or the genus Escherichia and having a resistance to isoleucine antagonist, produce L-threonine by fermentation in higher yield and in more amount of L-threonine accumulated. 
Toray Industries, Inc.
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Makoto Masae Kyousuke Katsushige Hiromi
Shirai Takeuchi Yotsumoto Yamada Tsutsui