Family with Sequence Similarity 203 Member B (FAM203B) is a protein encoded by the FAM203B gene (8q24.3) in humans. While FAM203B is only found in humans and possibly non-human primates its paralog FAM203A is highly conserved. The FAM203B protein contains two conserved domains of unknown function DUF383 and DUF384 and no transmembrane domains.
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