Fig. 4: Collagen VI is the abundant polymer concatenating with AL59.

a The 2D class average reveals two half-beads linked by an intra-bead fibre. Each half-bead entails head, body and tail substructures. Inter-bead fibres appear blurry, likely due to high flexibility. b Two views of the half-bead map that is visualised according to depicted σ-colour scale. The main features (darker blue) are comparable to a map at a threshold of 1.5 σ. See Supplementary Figs. 4 and 5.