sentences:  The σ1 receptor has been shown to appear in a complex with voltage gated K+ channels (Kv1.4 and Kv1.5), leading to the idea that σ1 receptors are auxiliary subunits.σ1 receptors apparently co-localize with IP3 receptors on the endoplasmic reticulum where they may be involved in preventing endoplasmic reticulum stress in neurodegenerative diseases .Also, σ1 receptors have been shown to appear in galactoceramide enriched domains at the endoplasmic reticulum of mature oligodendrocytes.