Fig. 4From: HLA-SPREAD: a natural language processing based resource for curating HLA association from PubMed abstractsNature and trends of HLA related publications in PubMed annually from 1975 onwards: Stacked Bar plot shows distribution of PubMed articles in different categories. a Diverse studies including clinical trials are reported, with maximum numbers represented in the “journal article” category. b A subplot of (a) after removing the most frequent “Journal article” type to visualise the trends in other categoriesBack to article page