The A20210 allele of the prothrombin gene is frequently associated with the factor V Arg 506 to Gln mutation but not with protein S deficiency in thrombophilic families.
J Investig Med High Impact Case Rep. 2022 Jan-Dec;10:23247096211058486. doi: 10.1177/23247096211058486.
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Phenotypic Heterogeneity in Patients with Homozygous Prothrombin 20210AA Genotype. A paper from the 2005 William Beaumont Hospital Symposium on Molecular Pathology.