inborn errors of metabolism antigen-peptide-transporter 2 deficiency https://rarediseases.info.nih.gov/diseases/732/antigen-peptide-transporter-2-deficiency antigen processing (TAP) deficiency syndrome An inborn errors of metabolism disorder caused by homozygosity for mutations in the TAP2 gene. It is characterizeed by nonhealing, chronic, ulcerative granulomatous leg lesions combined with recurrent otitis media and sinopulmonary infections. GARD:0000732 TAP 2 deficiency MONDO:0022468