Selection of inorganic nitrogen source and concentration Some studies showed that inorganic nitrogen significantly improved S
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doi: 10.1016/j.actbio.2019.05.057 103 YangJ.ZhaoY.CaoJ.GongC.ZuoJ.ZhangN.et al
Other reports, however, propose that an increase in plasma or serum MMA during pregnancy is normal and does not reflect a low vitamin B12 status and caution that serum MAA may not be a reliable biomarker of vitamin B12 status among pregnant women (Bae et al., 2015)
