source	studies
Blood	67
Feces	11
Liver	10
Spinal cord	8
Heart	5
Cecum	4
Kidney	4
Macrophages	4
Cultured cells	4
Muscle	3
Lung	3
Colon	3
Intestine	2
Fibroblast cells	2
Brain	2
Cells	2
Scalp	1
Small intestine	1
Spleen	1
Stomach	1
Suspended Marine Particulate Matter	1
Thyroid	1
Tumor cells	1
Tumor tissue	1
Unspecified	1
Vaginal epithelium	1
Algae	1
Worms	1
Amniotic fluid	1
Bacterial cells	1