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The synthesis of gammaG, gammaA, gammaM, beta(1C)/beta(1A), C'1 esterase inhibitor, ceruloplasmin, transferrin, hemopexin, haptoglobin, fibrinogen, alpha(1)-antitrypsin, orosomucoid, beta-lipoprotein, alpha(2)-macroglobulin, and prealbumin was studied in 15 normal human embryos and fetuses of 29 days to 18 wk gestation and in the yolk sacs of four embryos from 5.5 to 11.5 wk gestation using tissue culture in (14)C-labeled amino acids followed by radioimmunoelectrophoresis. The human embryo as early as 29 day gestation synthesized beta(1C)/beta(1A), C'1 esterase inhibitor, transferrin, hemopexin, alpha(1)-antitrypsin, beta-lipoprotein, alpha(2)-macroglobulin, and prealbumin in culture. At 32 days gestation ceruloplasmin and orosomucoid were also synthesized, but synthesis of fibrinogen was not observed before 5.5 wk. Synthesis of gammaM occurred as early as 10.5 wk gestation, and gammaG synthesis was found in cultures as early as 12 wk gestation; gammaA synthesis was not detected in any of the tissue cultures. With the exception of the gamma-globulins, each of the proteins studied was synthesized by the liver, but additional sites of synthesis for some of these proteins were also found. Synthesis of gammaG and gammaM occurred primarily in the spleen, but other sites of synthesis were noted as well. Changes in the concentrations of most of these proteins and plasminogen in embryonic and fetal serum from 5.5 to 41 wk gestation, in amniotic fluid from 6.5 to 38 wk gestation, and in the sera of neonates during the 1st 3 wk postpartum are described. Although gammaA, gammaM, ceruloplasmin, or haptoglobin were not detectable in some of the embryonic and fetal sera, gammaA and ceruloplasmin were both present as early as 6.5 wk gestation, haptoglobin by 9.5 wk gestation, and gammaM by 17 wk gestation. Each of the other proteins were present in all of the sera examined.

the journal of clinical investigation/the journal of clinical investigation

Development of γG, γA, γM, β1C/β1A, C′1 esterase inhibitor, ceruloplasmin, transferrin, hemopexin, haptoglobin, fibrinogen, plasminogen, α1-antitrypsin, orosomucoid, β-lipoprotein, α2-macroglobulin, and prealbumin in the human conceptus