title: Gradients for isoelectric focussing at low pH.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis; D003036:Cobalt Isotopes; D004586:Electrophoresis; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007525:Isoelectric Focusing; D008722:Methods; D011247:Pregnancy; D011485:Protein Binding; D012996:Solutions; D013997:Time Factors; D014805:Vitamin B 12 / Q000032:analysis
chemical_list: D003036:Cobalt Isotopes; D007202:Indicators and Reagents; D012996:Solutions; D014805:Vitamin B 12