SUMMARY
A cDNA clone of D.immitis in the expression vector/gtll gave positive reaction when screened with a specific antisera raised against sea urchin tubulin. The clone contained a 342 base pair insertion; the DNA sequence is about 75% homologous to tubulin sequences of other organisms, whereas the deduced amino acid sequences is about 90% homologous. The Southern blot analysis inicates a unique restriction map for the DNA surrounding the tubulin clone suggesting the presence of only one-tubulin gene in D.immitis.