Figure 1.

Alignment of amino acid sequences of coral β_Cn1 and sponge β_Po1 with β₁-like integrin subunits. Numbers above the sequences indicate the 56 conserved cysteines, and numbers to the right of each block denote the position in the matrix. Residues mentioned in the text are indicated by ∗ below the block. The amino acid change and stop codon in the alternatively spliced sponge cDNAs are indicated below the block at position 521. The transmembrane domain is the largely green region around position 920. No attempt was made to align the signal sequences before the first conserved cysteine. The color scheme used to indicate amino acid similarity is: yellow, proline; red, cysteine; magenta, alanine, glycine, serine, and threonine; blue, asparagine, histidine, phenylalanine, tryptophan, and tyrosine; cyan, arginine and lysine; green, isoleucine, leucine, methionine, and valine, and black, aspartic acid, glutamic acid, and glutamine.