Table 2. Contamination of commercial human DNAs with mouse DNA.¹ .

Manufacturer	DNA Specimen	Lot no.	pro (copies/rxn)	gag	pol	mtDNA 2 (copies/µg)	IAP 2 (copies/µg)
Biochain	Human leukocyte DNA	A807119	8,000	Pos	Pos	232,000	39,200
	Human leukocyte DNA3	B210149	Neg	Neg	Neg	1–10	1–10
	Dementia DNA	B409046	10	Pos	Pos	46	120
	Parkinson's DNA	B303007	1–10	Pos	Pos	1430	877
	Alzheimer's DNA	B111073	10–20	Pos	Pos	6	1120
	Multiple sclerosis DNA	B409045	1–10	Pos	Pos	52	16
	Raji DNA	NA4	Neg	Pos	Pos	58	10–20
	Jurkat DNA	NA	Neg	Pos	Pos	2	10–20
	K562 DNA	NA	Neg	ND	Neg	6	Neg
	MCF-7 DNA	NA	Neg	ND	Neg	Neg	10–20
Sigma-Aldrich	Male placental DNA	88F3847	Neg	Neg	Neg	Neg	Neg
	Female placental DNA	NA	Neg	Neg	Neg	Neg	Neg

¹1 ug of the human DNAs were tested using quantitative (qPCR) pro and nested pol and gag PCR assays. Copies/µg DNA is provided in parentheses for specimens with evidence of contamination.

²Mouse DNA contamination was detected using mitochondrial DNA (mtDNA) and intracisternal A particle (IAP) PCR qPCR assays.

³Second lot of human DNA sample received from Biochain after informing them of the contamination results.

⁴NA, information not available.