Board Thread:Naruto Gaiden/@comment-1018594-20150610113403/@comment-5547501-20150616092248

Somebody already brought this up, but in the chapter Suigetsu, when finding the DNA for testing, says "I thought this was from when Karin was born but.."

This could be a mistranslation but the DNA sample looks a bit large to be a hair though around the right size to be an umbilical cord. It could be Sarada's which is why it came up with a match. Karin might have had to help with Sarada's birth or something and that is why she has it in her desk.