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In page Constriction ring syndrome:

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The first is the intrinsic theory, which was proposed by Streeter in 1930. This theory implicates an anomaly in germ plasm resulting in the defects.[1] This theory is reinforced by the clinical presentation of the constriction rings with other internal visceral and systematic anomalies.[1] Because of these other anomalies, the names constriction ring syndrome, constriction band syndrome, and Streeter bands are given to this defect/disease. This is sometimes attributed to vascular disruption shared between cleft palate and other forms of cleft defects occurring together with ABS; this co-occurrence suggests an intrinsic defect of the blood circulation.[citation needed]