Updated publication reference for PubMed record(s): 29184206. Here we exploit label-free quantitative tandem mass-spectrometry proteomics to create the first in-depth quantitative proteomic survey of regions of the postnatal human brain. We adopted a dual approach to analysing these human brain samples similar to that of a recent high-quality study of the mouse brain proteome by Sharma et al, 2015. First was the discovery phase, designed to create a highly sensitive, heavily fractionated spectral library for each adult brain region. Then, to produce a quantitative run for each adult and postnatal development sample, single shot LC-MS/MS runs were used to accurately quantify proteins based on detected precursor peptide ion mass.