Purified elastic material from fish swim bladder was fragmented and observed under the electron microscope. Elastic fibers were digested with unfiltered trypsin and also with trypsin sterilized by filtering through a Seitz microfilter. When digestion is not done under absolutely sterile conditions, “fine threads” described by Gross(2) as a component of the elastic tissue are observed.
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Francht et al. (1951) studied this question.