Abstract
1. 1. The restriction patterns of three different Antarctic fish DNA ( P. bernacchi, N. rossi and C. kathleene) have been analysed. 2. 2. The restricted DNAs have been probed for the presence of the heat shock 70 sequence (hsp70) by using the corresponding Drosophila sequence. The three patterns are closely related for the presence of several bands in common, though a closer arrangement for the hsp70 gene is present in P. bernacchi and N. rossi. The analysis with different stringency conditions has also suggested that in these fishes more than one copy of hsp70 per genome is present. 3. 3. Poly-A RNA analysis with Northern blot have shown that the hsp70 gene is transcribed, upon temperature increase, between 5 and 12°C with a maximum of expression at 8°C.
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