Then we have the problem of CONTAMINATION:
(ref: Abundant Human DNA Contamination Identified in Non-Primate Genome Databases, PLOS-ONE, 2011):
"Using a primate specific SINE, AluY, we screened 2,749 non-primate public databases from NCBI, Ensembl, JGI, and UCSC and have found 492 to be...