Table 1

Saccharomyces cerevisiae strains used in the study.
Strain	Description	Reference

USM21	Polyploid industrial strain	[35]
TMB3400	USM21 (his3:: YipXR/XDH/XK) + random mutagenesis – produces XR, XDH, XK	[20]
CEN.PK 113-7A	Laboratory strain MATa his3-Δ1 MAL2-8c SUC2	[36]
TMB3290	CEN.PK 113-7A (MATa his3-Δ1 MAL2-8c SUC2) his3::YipXDH/XK – produces XDH, XK	This work
TMB3001	CEN.PK 113-7A (MATa his3-Δ1 MAL2-8c SUC2) his3::YipXR/XDH/XK – produces XR, XDH, XK	[34]
TMB3260	TMB3001 PGK1p-XYL1 – Overproduces XR	[22]

Almeida et al. Biotechnology for Biofuels 2008 1:12 doi:10.1186/1754-6834-1-12