Nomenclature	Glycerol‐3‐phosphate transporter	Sugar phosphate exchanger 2	Glucose‐6‐phosphate transporter
Systematic nomenclature	SLC37A1	SLC37A2	SLC37A4
Common abreviation	SPX1	SPX2	SPX4
HGNC, UniProt	SLC37A1, P57057	SLC37A2, Q8TED4	SLC37A4, O43826
Endogenous substrates	glycerol 3‐phosphate, glucose 6‐phosphate	glucose 6‐phosphate	glucose 6‐phosphate
Stoichiometry	Glucose 6‐phosphate (in): phosphate (out) [379].	Glucose 6‐phosphate (in): phosphate (out) [379].	Glucose 6‐phosphate (in): phosphate (out) [84].
Comments	–	–	Multiple polymorphisms have been described for the SLC37A4 gene, some of which associate with a glycogen storage disease [6].