Polyacrylamide gel isoelectric focusing (PAGIF) with carrier ampholytes was used for the determination of Tf phenotypes in a sample of 965 unrelated healthy blood donors from Tuscany (Italy). Thirteen rare variants in a heterozygote state were found (four Tf D, seven Tf B, and two rare Tf C subtypes). Among them two apparently new variants, tentatively called Tf C15 and Tf B4, were identified. The rare Tf B0mutant was also observed.
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