Expansion.

diff --git a/biblio/15289471.mdwn b/biblio/15289471.mdwn
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--- a/biblio/15289471.mdwn
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 [[!meta title="Regional patterns of gene expression in human and chimpanzee brains."]]
-[[!tag chimpanzee brain visual_cortex variability]]
+[[!tag chimpanzee brain visual_cortex variability transcriptome]]
+
+Khaitovich P, Muetzel B, She X, Lachmann M, Hellmann I, Dietzsch J, Steigele S, Do HH, Weiss G, Enard W, Heissig F, Arendt T, Nieselt-Struwe K, Eichler EE, Pääbo S.
+
+Genome Res. 2004 Aug;14(8):1462-73 doi:10.1101/gr.2538704
+
+Regional patterns of gene expression in human and chimpanzee brains.
+
 [[!pmid 15289471 desc="Individual variations are stronger than regional variations in cortex. Developmental genes are implicated in inter-reigonal, but not inter-species variations. Differential interspecific variation correlates with recent chromosomal duplications."]]