Eccentric muscle actions cause ultrastructural changes in human subjects (J Appl Physiol 2009 a, b). (cmbn.no)
Allen's past work has included ultrastructural studies of mites, development and characterization of pharmaceuticals, metal pathology, and mite taxonomy. (hartwick.edu)
This was counted at ultrastructural level (Fig. 3 k and l) and confirmed by semiquantitative RT - PCR (SI Fig. 22) in vivo. (pnas.org)