Al - Hayani et al. (2009) also reported that the fibers of the anterior and middle regions ran vertically, while the fibers of the posterior region ran horizontally. (strengthandconditioningresearch.com)
Yet the root causes and middle region of the chain of cause and effect for the rising incidence of hypertension with age are not nailed down at this point: it is all very much up for debate. (fightaging.org)
Tanaka had sequenced the middle region of the code for NS5B, the enzyme that makes new genome copies during replication. (discovermagazine.com)