In adult lampreys, the notochord is a persistent, cartilaginous rod that is surrounded by cartilaginous arcualia, forming an early version of the vertebral column, and provides the primary support structure throughout their lifetime. Unlike most vertebrates where the notochord is replaced by a bony or cartilaginous vertebral column, lampreys are among the jawless vertebrates that retain their notochord into adulthood.
In adult lamprey the Notochord is _____?
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