Fig. 4

Summary of database content. The current version of the database contains 1228 quantitative estimates and 50 cell morphologies, obtained from 375 experiments reported in 245 sources. Contents are sorted and displayed in pie charts according to key metadata elements. The most common journal sources include the Journal of Comparative Neurology, Journal of Neurochemistry, Neuroscience, and Brain Research. Most sources were published in 2000 or later. Experiments reported are primarily from male, adult animals, with slightly more mouse data included compared to rat data. Through our translation process for anatomical location metadata, 80 anatomical terms were translated to 21 terms found in standard rat and mouse atlases. Data on a total of 100 cell types are included in the database, with approximately half of the 668 derived data records related to TH positive neurons or all neurons. Of the 1228 quantitative estimates found in the database, 501 are total number estimates and 727 are density estimates. These are mainly estimated numbers of neurons, cells or glia, with substantia nigra and striatal regions heavily represented. The 50 cell morphologies in the database are mainly from striatal regions (nucleus accumbens, caudoputamen, or striatum overall). Additional metadata are represented in the database, which is available from the EBRAINS Knowledge Graph²⁵.