“…Injection of various signal transduction activators and inhibitors suggests the presence of a Mg 2+ receptor linked to tyrosine kinase and IP 3 -mediated Ca 2+ release from internal stores (Lindsay and Clark 1994 ). A Mg 2+ -dependent egg activation has more recently been shown in P. monodon , suggesting that this is a common mechanism in the Dendrobranchiata (Pongtippatee et al 2010 ). Although penaeid sperm do not contain recognizable centrioles, functional centrosomes are introduced by the sperm, which organize the microtubule-based movements of the pronuclei (Lindsay et al 1992 ).…”