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Table 1 Summary of the effects of HDC inhibitor, HA, HA receptor antagonists and KCl on settlement without induction, arm retraction and caspase activity for competent larvae

From: Histamine is a modulator of metamorphic competence in Strongylocentrotus purpuratus(Echinodermata: Echinoidea)

Treatment Settlement Rel. Arm Length Caspase Activity
HA - - -
H1Ra -
H2Ra - -
H3Ra -
  1. All effects indicated in this table were statistically significant (p < 0.05).
  2. all results significant for p < 0.05.