Your search term IL12B returns the following data from GWAS Central:
Phenotype search results:
Search term IL12B was not recognised as a MeSH/HPO phenotype term or synonym

Gene/region search results:
71 Study Datasets reported containing markers in gene or region IL12B (no 5′ and no 3′ flanks) with -log p ≥ 0View and refine results..
31 Markers in gene or region IL12B with -log p ≥ 0View and refine results..
22 Texts contain the keyword IL12BView and refine results..

Studies search results:
22 Studies contain the keyword IL12BView and refine results..

Marker search results:
Search term IL12B was not recognised as a marker identifier or identifiers