http://linkedlifedata.com/r... | skos:definition | "Structure or material found in the flagella of mammalian sperm that surrounds each of the nine microtubule doublets, giving a 9 + 9 + 2 arrangement rather than the 9 + 2 pattern usually seen. These dense fibers are stiff and noncontractile." [ISBN:0824072820] | lld:geneontology |