1.2.1.25 2-oxobutanoate degradation I - 1.2.1.25 anteiso-branched-chain fatty acid biosynthesis - 1.2.1.25 even iso-branched-chain fatty acid biosynthesis - 1.2.1.25 isoleucine metabolism isoleucine metabolism 1.2.1.25 L-isoleucine degradation I - 1.2.1.25 L-leucine degradation I - 1.2.1.25 L-threonine degradation V - 1.2.1.25 L-valine degradation I - 1.2.1.25 odd iso-branched-chain fatty acid biosynthesis - 1.2.1.25 valine metabolism valine metabolism