Other research shows that ADHD children with a particular gene variation have thinner tissue in the area of the brain that's associated with attention. (babycenter.com)
Spatial resolved quantitation of chemical species in thin tissue sections by mass spectrometric methods has been constrained by the need for matrix - matched standards or other arduous calibration protocols and procedures to mitigate matrix effects (e.g., spatially varying ionization suppression). (ornl.gov)
They concluded this was due to the longer cast distributing pressure evenly over nearly the full length of a leg, rather than over a shorter area on thin tissue covering bony protrusions. (morrisanimalfoundation.org)