Researchers now have shown that they are instead made up of many individual bioelectric units generating energy- like a Tesla Battery. https://embopress.org/doi/10.15252/embj.2018101056&h=AT3OHOR9YNgIqsHb4XFIbhoUpBL19EVLq8Q_PMYJVsGQ9H0SjeCMHy_rqVPMi0G6bHdKB-1f0T-u6LjGFeEOQg-F7WCyTVtTdjsgvkooSCBz7E97_40PIWv3rwCXenFxiixIuleO8vaIbrW7nPivqw6_aeusnhWBaNGD1X7O5WUti9cHz2XtvnuqUCir7ik