They've evolved a high molecular mass form of hyaluronan. This is hypothesized to prevent cells from forming tumors. In humans, hyaluronan and related molecules are thought to aid cancer metastasis:
Abbreviations:
HA - hyaluronic acid, a synonym for hyaluronan
HAS - hyaluronic acid synthase, makes HA
HAR - hyaluronic acid receptor
HAase/HYAL - hyaluronidase, enzyme that degrades the extracellular matrix
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