Assertion: formaldehyde | /r/HasProperty | added after the start of the cultures
Facets:
Source sentences:
text: In vitro formaldehyde induced MN formation in human blood cells at concentrations >= 300 μM (9 μg/mL) if formaldehyde was added 44 h after the start of the cultures; the clastogenic effects were paralleled by cytotoxic effects.