. "esponding to a sequence such as defined in a), b) or c); and [0097] e) a nucleotide sequence modified by a sequence such as defined in a), b), c) or d). [0098] As far as homology with the nucleotide sequences SEQ ID No. 3, SEQ ID No. 4, SEQ ID No. 5, SEQ ID No. 11, SEQ ID No. 12, SEQ ID No. 13 or one of their fragments is concerned, the homologous, especially specific, sequences having a percentag" . . .