Using the quick search there are shown up to three reports about Klf4:
One of the four ingredients in the genetic recipe that scientists in Japan and the U.S. followed last year to persuade human skin cells to revert to an embryonic stem cell state, is dispensable in ES ...
Biowissenschaften Chemie |Using the fulltext-search for the word Klf4 you can set up serveral searching-options > choose search options