Figure 1. Sequence length distribution of the human contaminant sequences obtained from DNA extracted from bone samples of a Myotragus balearicus and an ancient lynx, and the putatively endogenous sequences from a Neolithic human and a Neandertal specimen obtained by 454-FLX pyrosequencing.
The contaminant reads in Myotragus are possibly fragmented by the bleach treatment; nevertheless, a large overlapping in the distribution length can be observed among samples.