Assertion: comfrey's pyrrolizidine alkaloid | /r/HasProperty | administered to human lymphocytes
Facets:
value: at these concentrations
type: OTHER
Source sentences:
text: Pyrrolizidine alkaloids extracted from comfrey were shown to damage chromosomes when administered to human lymphocytes at concentrations of 140 mg/mL and 1400 mg/mL. At these concentrations, sister-chromatid exchange and chromosome aberrations were observed.