The Biofuels Digest Index, an index of publicly traded biofuels stocks, was flat at 68.78 despite an advanced biofuels decline. For the day, Amyris (AMRS) slid 3.06 percent to $2.44, while Codexis (CDXS) lost 4.21 percent to $4.51. Among other equities, Gevo (GEVO) shed 6.99 percent to $2.53. Overall, declines and advances were even for the day.