The PichiaPink? Vector Kit contains the pPINK-HC and pPINK-LC vectors for use with the PichiaPink? Yeast Expression System. The pPINK vectors are built around the ADE2 gene for complementing the ade2 deletion in the PichiaPink? strains. You can order the PichiaPink? Vector Kit to refill your PichiaPink? Yeast Expression System Kits.