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	At3g60280	Probably acts as an electron carrier involved in oxygen activation and/or lignin formation.	No verified direct reference in this release