The first widely accepted model of membrane structure, from 1935, was proposed by:

1. Two different pairs of names attach to membrane models, decades apart. 2. The first widely accepted model was proposed in 1935 by Hugh Davson and James Danielli. 3. It was based on the railroad track appearance of the membrane in early electron micrographs. 4. Singer and Nicolson came later with the fluid mosaic model, and the other pairs worked on DNA. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_