Abstract
A gene library of X. laevis was constructed from embryonic DNA partially digested with restriction endonucleases HaeIII and AluI and joined to the phage .lambda. Charon 4 cloning vector with EcoRI linkers. Nucleotide sequences from 3 of the 4 related vitellogenin genes were isolated. Two of the genes (called A1 and A2) were isolated in their entirety together with long stretches of flanking sequences. These 2 closely related vitellogenin genes have lengths of about 21 and 16 kilobases [kb], but both produce a vitellogenin mRNA of 6.3 kb.