The hemoglobins of two turtles (Testudines) -Chrysemys picta bellii (suborder Cryptodira) and Phrynops hilarii (suborder Pleurodira)were investigated. In both specimens we found two hemoglobin components with two distinct -chains. The -chains of the component HbD of Chrysemys picta bellii and of the component CII ofPhyrynops hilarii belong to the a°-type, Abkürzungen: Quadrol = yv,yv,A^',A^'-Tetrakis(2-hydroxypropyl)ethylendiamin; Reagenz I = l-(Isothiocyanato)benzol-4-sulfonsaure, Natriumsalz; Reagenz IV = 7-(Isothiocyanato)naphtalin-l,2,5-trisulfonsäure, Trinatriumsalz; TosPheCH 2 Cl = (W-Tosyl-L-phenylalanyl)chlormethan; CP = Chrysemys picta bellii\ PH = Phrynops hilarii; HU = Human; FA = Fasan; Hb = Hämoglobin; HPLC = Hochdruckflüssigkeitschromatographie. * 75. Mitteilung über Hämoglobine; 74. Mitteilung s.LcJ 1 1.which has so far been reported to occur only in birds. The complete amino-acid sequences of both a D -chains are presented. Our further investigations on hemoglobins of other reptiles (Crocodilia, Lacertilia, Serpentes) did not give any evidence for the expression of a°-globin genes in the species examined.These findings are discussed with especial reference to the physiology of respiration. It is supposed that a D -genes were of certain significance in earlier times. There are findings suggesting that a°-genes are embryonic genes with persistent expression in many adult birds and turtles.
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