Tubular cells ping.
I couldn't find anything by Jason Butler at Cell Stem Cell in 2010. At PubMed, butler j found too many titles. Using butler j, nolan dj found this citation, but it came without a specific URL, just the general one for PubMed. Fortunately, PubMed links to the source. Using butler j, nolan dj and another author, Vertes EL, got nada at PubMed.