Researchers have discovered a marine compound off the coast of Key Largo that inhibits cancer cell growth in laboratory tests. Largazole, named for its Florida location and structural features, seeks out a family of enzymes called histone deacetylase. Overactivity of certain HDACs has been associated with several cancers such as prostate and colon tumors, and inhibiting HDACs may activate tumor-suppressor genes that have been silenced in these cancers.