Author contributions
VFL and DMD designed the experiment. VFL, FBSF, NPP and SACS performed
the 13C-labelling experiment. Mass spectrometry
analysis was performed by DBM under the supervision of ARF. Data
analysis was performed by VFL, FBSF, SACS, AE, JK and DMD. All authors
contributed to write the final manuscript. DMD obtained funding and is
responsible for this article.