Fig. 2
From: Surfactant protein D and bronchopulmonary dysplasia: a new way to approach an old problem
Recombinant human SP-D observed by atomic force microscopy (AFM). AFM images of rhSP-D in which the different oligomeric forms of SP-D can be observed: trimers (single and short stick-like structures), hexamers composed of two trimers observed as V-shaped structures in these images, dodecamers (cross-like structures) the most common specie observed in these images, and higher order oligomers or “fuzzy balls” with a ball-like shape. The scale bar represents 200 nm