Quote Originally Posted by ?igma
Hm, I've seen them talk about her recieving the flesh of Teresa, instead of that of a yoma, I don't think they said anything about 1/4th :P Maybe I'm just nitpicking but I personally don't believe in "exact"science. Just like Claymores are not "exactly" 50/50. Of course, it's only an animé and it's true as long as they say it is.

har..I'm just tired..zzZZzz ;'(
Yes, it's revealed. When Clare encounters Irene? who lost her left arm against Priscilla but survived I believe, and later cuts off her right arm and gives it to Clare. She tells Clare that she's weaker than most Claymore due to the fact that she's only 1/4th, taking on the flesh of a Claymore and not another full yoma.