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Medical Definition of Haemoglobin Portland
1. A form of embryonic haemoglobin containing the ζ chains of haemoglobin Gower-1 and the g chains of Hb F, thus having the formula ζ2g2; essentially disappears by the third month of pregnancy. Compare: haemoglobin Gower-1, haemoglobin Gower-2. (05 Mar 2000)