While not specifically about methylene blue, the EurekaAlert above quoted Dr. Bruce Ames praising the work. Ames is a pretty heavy fellow as noted in this NIH blurb:
"Dr. Ames was director of the National Institute of Environmental Health Sciences Center at U.C. Berkeley for twenty-three years, and he chaired the U.C. Berkeley Department of Biochemistry for six years, 1983–1989. Prior to that he was the Microbial Genetics section chief at the National Institutes of Health in Bethesda, Maryland, a National Science Foundation senior fellow in the laboratories of Frances Crick in Cambridge, England, and F. Jacob in Paris, France, and a biochemist with the National Institutes of Health, where he began his career."