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Alignment of amino acid sequences of selected VHH phage clones. Sixteen clones are divided into four groups: och1 (VHH-15, 17, 20, 25, 27, 31, 34, 35, 39, 43, 44, 47, and 48), och2 (VHH-28), och3 (VHH-32), and och4 (VHH-36). The deduced amino acid sequences of the four clones are given in the single-letter code. (∼) Absence of amino acid residues; (.) residues identical to those of clones in och1.
