Author contributions
L.C.S.-L. performed the reductions, quantified the peptides, analyzed the data, and edited the manuscript. S.H.N. contributed to conception, design of the experiments, analyzed the data, performed immobilization experiments (efficiency of covalent modification after treatment), and edited the manuscript. C.R.T conceived and designed the experiments, performed controls, analyzed the data (statistics), and prepared the manuscript
Acknowledgments
This work was supported by the Office of Naval Research and the Naval Research Laboratory. The opinions expressed herein are those of the authors and do not reflect those of Office of Naval Research, the Naval Research Laboratory, the US Navy or Department of Defense, or the US Government.
Competing interests
The authors declare no competing interests.