Figure 3.

Amino acid exchanges between mothers and their infants in comparison to the Reference Sequence. Amino acid positions are numbered from the start codon of each protein. Only amino acid exchanges from mothers (M1–M5) to their infants (1–5) are depicted, the reference sequence according to Galibert et al.(1979) is listed for comparison; a heterogeneous population according to the nucleotide sequence is shown in italics.* = stop ; met = start codon, **aa exchange prevents preS2 production.