Correction: Toll-Like Receptor Signaling in Vertebrates: Testing the Integration of Protein, Complex, and Pathway Data in the Protein Ontology Framework

• Cecilia Arighi, 
• Veronica Shamovsky, 
• Anna Maria Masci, 
• Alan Ruttenberg, 
• Barry Smith, 
• Darren A. Natale, 
• Cathy Wu, 
• Peter D’Eustachio