adapted predicate names for expression:
- :expression as parent of :developmentalStageInfo, :expressionProfile, :expressionInfo
- :undetectedExpression links an isoform to an annotation having only negative/undetected expression level in all evidences
- :detectedExpression links an isoform to an annotation having at least one evidence showing positive, low, medium, high expression level
uncommented evidence :negative xxx:boolean triples