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Even Teru Wakayama, a co-author on the Nature reprogramming papers that stunned the stem cell world this month, says he can’t reach the first author on both: Haruko Obokata.

Noting this in an email to Bioscience Technology, Wakayama added, however, that despite many recent, anonymous claims that labs can’t repeat the work—which would be historic work, if true—he is sure some eventually will.

 “As you know, the work producing the first cloned animal, Dolly the Sheep, was not reproduced for a year-and-a-half until mice were cloned,” said the pioneering Wakayama (who was that first mouse cloner. He also was the first to clone long-dead frozen mice, and 25 generations of mice from one.)

“And the first human cells cloned last year—that work still has not been reproduced,” he said. Wakayama added that he, himself, reproduced Obokata’s work with her at the Riken Institute—but hasn’t, since he moved to Yamanashi University. “Even me: I succeeded in this work at Riken, but I have not been able to in my new lab.”

Still, his conclusion was firm: “I do not doubt...