2007), graph kernels (Airola et al., 2008) and subsequence kernels (Kim et al., 2010), show some promising results for PPI extraction.
while tree kernels based on constituent parse trees achieve great success in semantic relation extraction (Zhang et al., 2006;Zhou et al., 2007a;Qian et al., 2008) and semantic role labeling (Moschitti, 2004;Zhang et al., 2008) from the newswire narratives, they haven't been fully explored for PPI extraction in the biomedical domain.