Keel- a ridge or carina Def: Dictionary of Ichthyology http://www.briancoad.com/Dictionary/G-Q.htm Is_a surface structure
Needed for Baldwin and Johnson, 1996
See uberon: http://www.obofoundry.org/wiki/index.php/UBERON:Main_Page
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See uberon:
http://www.obofoundry.org/wiki/index.php/UBERON:Main_Page