Comment on

• Epistasis among adaptive mutations in deer mouse hemoglobin.

  Natarajan C, Inoguchi N, Weber RE, Fago A, Moriyama H, Storz JF. Natarajan C, et al. Science. 2013 Jun 14;340(6138):1324-7. doi: 10.1126/science.1236862. Science. 2013. PMID: 23766324 Free PMC article.
• Root effect hemoglobin may have evolved to enhance general tissue oxygen delivery.

  Rummer JL, McKenzie DJ, Innocenti A, Supuran CT, Brauner CJ. Rummer JL, et al. Science. 2013 Jun 14;340(6138):1327-9. doi: 10.1126/science.1233692. Science. 2013. PMID: 23766325
• Evolution of mammalian diving capacity traced by myoglobin net surface charge.

  Mirceta S, Signore AV, Burns JM, Cossins AR, Campbell KL, Berenbrink M. Mirceta S, et al. Science. 2013 Jun 14;340(6138):1234192. doi: 10.1126/science.1234192. Science. 2013. PMID: 23766330