Assertion: white eye mutation | /r/HasProperty | caused
Facets:
value: due to the absence of two pigments
type: CAUSE
Source sentences:
text: The white eye mutation in fruit flies is caused due to the absence of two pigments associated with red and brown eye colors; peridines (red) and ommochromes (brown) .  
text: The white eye mutation in fruit flies is caused due to the absence of two pigments associated with red and brown eye colors; peridines (red) and ommochromes (brown) .