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Comparison of the secondary structure of the T4 tail tube protein (gp19) with that of the putative 0305φ8-36 tail tube protein (gp140). The regions of 0305φ8-36 gp140 with similarity to gp141, as determined by Psi-Blast, are marked with grey boxes. The indel in gp140 thus defined is removed from the comparison with T4gp19.
