( a ) represents period-end outstanding principal balances of loans transferred to the securitization qspes . credit card loans at december 31 , 2008 , national city 2019s credit card securitization series 2005-1 , 2006-1 , 2007-1 , 2008-1 , 2008-2 , and 2008-3 were outstanding . our continuing involvement in the securitized credit cards receivables consists primarily of servicing and a pro-rata undivided interest in all credit card receivables , or seller 2019s interest , in the qspe