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In the version of this article initially published online, several errors appeared in the HTML version. In the section "EISA recovers the role of transcription during neurogenesis, " the expression "(t1/2 = 1/α)" should have read "(t1/2 ~ 1/α)" in the sentence "mRNA half-life, on the other hand, is inversely proportional to the degradation rate (t1/2 = 1/α). " In the Online Methods, "Analysis of circadian dynamics data sets, " the symbol "<-" was given as "≤" in two cases and as "≤<" in one case; the formulas "coeffs ≤ lm(y ~ cbind(cos(w*t),-sin(w*t)))$coefficients"; "C ≤< sqrt ( In the version of this article initially published online, the received date of the paper was given as 17 October 2014; the correct date is 11 July 2014. On p.4, left column, second paragraph, 1 mM Scr7 should have been 1 mM Scr7; in Online Methods, second paragraph, Cas9 mRNA, sgRNA and template oligos were erroneously given in ng/ml rather than ng/ml. A technique was misidentified as ChIP; in all cases it should be "chip. " The possibility of using Scr7 as a means of enhancing homology-directed repair was recently also mentioned in a