PGC and major depressive disorder: First, while both studies included PGC phase 1 samples35, the GERA36 samples (7,231 cases and 49,316 controls), and the UK Biobank (UKB) samples, the “depression” GWAS meta-analysis33 additionally included samples from other cohorts, e.g. iPSYCH, deCODE, GenScot, and the incremental core samples from PGC MDD Working Group phase 2 analysis36.