Traditional information extraction would be content with extracting two binary relation instances (NEG-REG,BCL,RFLAT) and (NEG-REG,IL-10,RFLAT), where NEG-REG represents a negative regulation (i.e., inhibition).
the sentence also discloses important contextual information, i.e., BCL regulates RFLAT by stimulating the inhibitive effect of IL-10, and likewise the inhibition of RFLAT by IL-10 is controlled by BCL.