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Books & reading guidesFrom the archive
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…part of proteins involved in thyroid hormone metabolism and antioxidant defense. Topics: thyroid, hypothyroidism, cold hands, cold feet, fatigue, free T4, free T3, TSH, Hashimoto’s, Graves’ disease, reverse T3, selenium, iodine

Books & reading guidesFrom the archive
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…istry panel, urine test, and hormone panel answer different questions. Ask why each test is recommended. Panels are collections of different measurements Dr. Purser places basic tests and hormone tests together. A CBC concerns blood cells;…

Gene referenceSep 23, 2026
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FOLR2 encodes folate receptor beta, a folate-binding protein expressed in particular cell types, including subsets of immune cells. It is distinct from the FOLR1 receptor and the SLC19A1 reduced folate carrier.

Gene referenceSep 23, 2026
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HLA-DQA1 contributes to an HLA-DQ protein that presents antigen fragments to CD4 T cells. HLA-DQ function depends on pairing with an HLA-DQB chain, so an isolated marker is not a complete HLA type.

Gene referenceSep 23, 2026
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HLA-DQA2 is part of the HLA class II region involved in immune recognition. It should not be treated as interchangeable with HLA-DQA1 or as a measurement of how well the immune system fights infections.

Gene referenceSep 23, 2026
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KIT encodes a receptor tyrosine kinase that responds to stem cell factor. It participates in blood-cell development and mast-cell biology, making the exact variant and testing context especially important.

Gene referenceSep 23, 2026
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VDR encodes the vitamin D receptor, which helps regulate gene activity in response to active vitamin D. A receptor variant does not by itself mean receptors are absent or that the blood vitamin D level is low.

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