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Maternal serum S100 protein in normal and Down syndrome pregnancies.
Abraha HD, Noble PL, Nicolaides KH, Sherwood RA.
Prenat Diagn 1999;19:334-6. -
Carbonic anhydrase isoenzymes CAI and CAII in semen, decidua, chorionic villi and various fetal tissues.
Ali Akbar S, Nicolaides KH, Brown PR.
Early Hum Dev 1998;10;51:205-11.