Succinyl CoA is formed by
Valine,isoleucine and methionine are influx of TCA cycle intermediate propionyl CoA which is conveed to succinyl CoA.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 253, fig 19.9
Valine
Isoleucin
Methionine
All of the above
Metabolism of protein and amino acid