Comparison of the putative cleavage sites of the F0 proteins of prototypes strains of the nine APMV serotypes, and requirements for exogenous protease.

†Basic amino acids (R/K) are underlined and in bold, and the downward arrow indicates the predicted site of cleavage.‡Virus replication in cell culture requires the supplementation of 10% v/v fresh allantoic fluid or acetylated trypsin (1 µg/ml).Note: APMV-1 (Avirulent) denotes strain LaSota, APMV-1 (Virulent) denotes strain GB Texas, APMV-2 to APMV-9 includes all the prototype strains.