Also, as of at least 2013, people were still publishing papers skeptical that neurogenesis is being measured here:<p>&gt;&quot;In the adult cortex, one point of consensus is that the numbers of adult-born neurons are low and their lives are short. Thus, we need to search for them, like needles in a haystack, perhaps in many “haystacks” subject to different conditions. In addition, supplemental approaches need to be developed since BrdU may label neurons repairing their DNA; alternatively, markers of DNA repair need to be routinely performed. Due to their low number, it is difficult to conclude whether the identified BrdU&#x2F;NeuN+ cells are the result of progenitor proliferation or neuronal repair.&quot;<p><a href="http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pmc&#x2F;articles&#x2F;PMC3534801&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pmc&#x2F;articles&#x2F;PMC3534801&#x2F;</a>