Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At2g02850	Forms a concentration gradient along the pollen tube growth path, with a lower level in the stigma papilla cell wall and a higher level in the transmitting tract extracellular matrix of the style.	No verified direct reference in this release
Arabidopsis	At1g17800	May act as a carbohydrate transporter.	No verified direct reference in this release