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The vitamin B12 levels of the maternal and fetal sera on 40 delivery cases, were assayed microbiologically, employing Lactobacillus leichmannii. The serum vitamin B12 content of the 14 non-pregnant women were also determined similarly as control. It was found that the vitamin B12 level of the maternal serum was considerably lower than that of the non-pregnant women, which is, in turn, still lower than that of the fetal serum. These findings confirm the previous observations, which suggest thatdoi:10.1272/jnms1923.27.1320 fatcat:cy4f62vhyffqfll7mgpocd2h5a