source	studies
Blood	43
Feces	8
Urine	7
Unspecified	6
Cultured cells	5
Amniotic fluid	2
Cyst fluid	2
Liver	2
Eye tissue	1
Colon	1
Fly Head	1
Heart	1
Hep G2 cells	1
Intestine	1
Kidney	1
Leaves	1
Brain	1
Lung	1
Microglia	1
Microglia cells	1
Placenta	1
Rhizosphere soil	1
Roots	1
Sputum	1
Stem cells	1
Tissue	1
Tumor cells	1
Cerebrospinal fluid	1
Eggs	1