Partial amino acid alignment of the of F- gene cleavage site (112 to 117) of the identified NDV isolates of our study and other NDV strains circulating in Egypt related to velogenic NDV genotype VII 1.1, as well as other vaccinal strains related to NDV genotype II using Bio-edit program. The dot (.) represents identity while single alphabet represents the difference in the amino acid sequence. Underlined isolates are isolates of our study.