- Sequencing of a 9.9 kb segment on the right arm of yeast chromosome VII reveals four open reading frames, including PFK1, the gene coding for succinyl-CoA synthetase (beta-chain) and two ORFs sharing homology with ORFs of the yeast chromosome VIII. Guerreiro, P., Azevedo, D., Barreiros, T., Rodrigues-Pousada, C. Yeast (1997)