Physical map of the Fugu ETV6 locus. The direction of transcription of the identified genes, when known, is indicated with an arrow. BACs and cosmids used in this study are indicated under the physical map. The approximate sizes of the inserts are indicated in parentheses. The position of the Sp6 and T7 extremities of the clones and the presence of Not I, Sfi I and Srf I restriction sites are also indicated. The asterisk (*) indicates a putatively non-functional copy of the ADP-ribose polymerase-like I gene.