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Very low arylsulphatase A (ARA) activity was found directly in amniotic fluid from two pregnancies where cultured amniotic fluid cells as well as cultured fibroblasts from the aborted fetuses were deficient in ARA. These observations differed significantly from parallel determinations of ARA activity in amniotic fluid, cultured amniotic fluid cells and cultured fibroblasts from the aborted fetuses in normal pregnancies
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Børresen et al. (1973) studied this question.
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