disease arises from structure disease arises from alteration in structure chromosome 21 (Human) ring chromosome 21 https://rarediseases.info.nih.gov/diseases/6083/ring-chromosome-21 https://www.malacards.org/card/ring_chromosome_21 MEDGEN:419409 UMLS:C2931422 MESH:C537109 R21 Ring 21 chromosome 21 ring Ring chromosome 21 syndrome NORD:947 Ring chromosome 21 syndrome is an autosomal anomaly characterized by variable clinical features, most commonly including growth retardation, developmental delay, intellectual disability, epilepsy, microcephaly, short stature, dysmorphic features, hypogammaglobulinemia, thrombocytopenia and unspecific skeletal anomalies (hemivertebrae, clinodactyly, syndactyly). In rare cases, it has been described in phenotypically normal individuals. Chromosome 21 Ring Ring chromosome type 21 GARD:0006083 SCTID:31325007 chromosome 21 en anneau Orphanet:1445 MONDO:0015437 ring chromosome disorder chromosome 21 disorder