WHY DO OYS­TERS MAKE PEARLS?

BBC Earth (Asia) - - Q&a -

It’s an im­mune re­sponse de­signed to pro­tect the oys­ter from a par­a­site or an in­jury (not just a grain of sand as is com­monly be­lieved). Cells from the man­tle of the oys­ter form a pearl sac around the ir­ri­ta­tion. The pearl sac then se­cretes cal­cium car­bon­ate and con­chi­olin pro­tein that builds up in lay­ers to form an im­per­me­able bar­rier.. LV

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