Assertion: valine | /r/ObjectUse | used in prior art
Facets:
Source sentences:
text: Separation methods for valine used in the prior art include an ion exclusion-chromatography method (Japanese Laid-open Patent Publication No. 1987-255453), a crystallization method using a precipitant (Japanese Laid-open Patent Publication No. 1996-333312, Japanese Laid-open Patent Publication