The genotype.saap data is a character matrix with dimensions 120x154. It contains 154 amino acid protein sites across 120 organisms. The data is used in combination with the phenotype.aa data to quantify the association between each amino acid substitution pair and the phenotype vector.
A matrix with 120 observations and 154 columns (some of which qualify as single amino acid polymorphisms).
Matrix with 120 rows and 154 columns, whereby each row is a protein sequence and the elements represent an amino acids.