Abstract
Extraction of washed Culex pipiens fatigens egg homogenate pellets with high ionic strength-high pH medium yields a crude yolk extract which can be divided into three fractions by gel chromatography. The major fraction resulting from chromatography appears to be Culex yolk protein. Our studies suggest that Culex pipiens fatigens yolk protein has a molecular weight of 3.8 × 10 5 daltons and contains protein bound phosphate, lipid and carbohydrate, as do many other vertebrate and invertebrate yolk proteins. Culex yolk protein appears to be composed of two classes of polypeptide chains of molecular weights of 1.6 × 10 5 and 0.82 × 10 5 daltons. Yolk protein appears to aggregate under the conditions used in this investigation.
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