Dude. You can easily plant that seedling still. Smarten up and check your germinations more often buddy. Clearly you left it in paper towel long enough for it to root in to it. Very stupid to let the bare root be seen by light. And taking pictures. WTF? Probably killed the, poor lil bastards.
Next time just let it grow in some dirt and see what happens.
you give little to none information on the seedlings and what you have done with them since they sprouted.
Like i said, looks like you fawked them.