Kv channel α subunit proteins are expressed in mouse myometrium. Results obtained from Western blots demonstrating the presence of immunoreactive bands for Kv1.1, Kv1.2, Kv1.3, Kv1.4, Kv1.5, Kv1.6, and Kv4.2 α-subunits in myometrium from nonpregnant (NP) and term-pregnant (P20) mice. Kv4.3 α-subunits were detected in the NP samples, but were undetectable in the term-pregnant mouse myometrium. Apparent molecular weights of each protein species are indicated at right. Different lanes contain samples from different animals, and each lane was loaded with 20 μg protein; 4–7 animals were assayed for each Kv channel α subunit protein.