Fig. 3. Tissue distribution of Na⁺/K⁺-ATPase 1a, 1b, 1c, 2 and 3 isoforms in brain, eye, gill, heart, liver, kidney, spleen, intestine, white muscle, red muscle and testis. Tissue distribution was determined using isoform-specific PCR (see text for more details) and ethidium bromide stained gels. Ethidium bromide stained gels give qualitative estimates of expression level, not quantitative. Actin is included as an internal control.