| http://www.w3.org/ns/prov#value | - solids therein, and more particularly relates to such a material which may be obtained from a mammalian tubular blood vessel and especially a bovine tubular blood vessel by substantial removal of the objectionable parenchymatous protein therefrom, especially by digestion with a proteolytic enzyme such as ficin followed by hardening with a tanning agent such as aqueous formaldehyde.
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