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type VI secretion system PAAR protein The PAAR domain is widespread, but this model represents a narrow clade that may occur in type VI secretion systems (T6SS), either free-standing or fused to a long extension. Effector domains of T6SS may be separate proteins, or may be fused to on of the tube or spike proteins: VgrG (spike), Hcp (tube), or this PAAR family (spike tip). Members of this family that have long extensions are likely to be T6SS effectors.
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