Structure

Sequence:

RXXFSTNXKDIXTLYLXFXAWAGVLXTXXXXXXXXXXXXXXXXXGNDHIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPXMXXXRMNNMSFWLLPPSLLLLLASAMVEAGAGTGWTVYPPLAGNYSHPGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAMTQYQTPLFVWSVLITAVLLLLSPPXXAAGITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFFGHPEVYILILPGFGMISHIVTYYSGKKEPFGYMGMVWAMMSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGVKVFSWLATLHGSNMKWSAAVLWALGFIFLFTVGGLTGIVLANSSLDIVLHDTYYVVAHFHYVLSMGXVFAIMGGFIHWFPLFSGYTLDQTYXKIHFXIMFIGVNLTFFPQHFLGLSGMPRRXXXXPDAYTTWNILSSVGSFISLTAVMLMIFMIWEXXXSKRKVLMVEEPSMNLEWLYGCPPPYHTFEEPVYMKS