Assertion: ngf's effect | /r/HasProperty | null
Facets:
value: after 4–8 h
type: TEMPORAL
Source sentences:
text: the addition of exogenous human NGF (100 ng/mL) at different time points of storage (0, 4, 8 h) differently influenced sperm traits i.e. NGF addition at time 0 positively affected all the pro-vital traits (kinetic, live cells) whereas, after 4–8 h, the effect of NGF was null or negative.