조개속 진주는 어떻게 생기나요?

조개속 진주는 어떻게 생기나요? 엄청 큰~조개에 진주가 색깔별로 엄청 많이 들어가있 는 것도 있고. 이런건 다 어떻게 생기는거죠??? <p class="se-text-paragraph se-text-paragraph-align- " id="SE-f9156fe9-2b03-4064-8657-ab3a0abec9fc" style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 0px; line-height: 1.8; font-family: se-nanumgothic, sans-serif; vertical-align: baseline; word-break: break-word; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(0, 0, 0);"><span class="se-fs- se-ff- " id="SE-7035f20e-d23e-4288-b1d6-b6f49ac82ed2" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; vertical-align: baseline;">진주조개 안에 이물질이 들어오면 그걸 진주조개가 분비물을 분비해 감싸면서 진주가 만들어집니다.<p class="se-text-paragraph se-text-paragraph-align- " id="SE-7f040c71-a5db-438d-be46-af18ecc5cb10" style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 0px; line-height: 1.8; font-family: se-nanumgothic, sans-serif; vertical-align: baseline; word-break: break-word; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(0, 0, 0);"><span class="se-fs- se-ff- " id="SE-7410d60d-00a2-4c71-973a-79d934d84439" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; vertical-align: baseline;">과거에는 이물질을 집어넣어야 그게 진주핵이 되서 진주가 만들어진다고 알려져 있었지만,<p class="se-text-paragraph se-text-paragraph-align- " id="SE-e3a7e723-2c43-40d4-8bba-08c0231af63d" style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 0px; line-height: 1.8; font-family: se-nanumgothic, sans-serif; vertical-align: baseline; word-break: break-word; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(0, 0, 0);"><span class="se-fs- se-ff- " id="SE-06b96ca6-1a48-4fea-9901-0077ba83d640" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; vertical-align: baseline;">최근에는 진주조개의 생식소와 장관 및 소화맹낭 부근에 이물질을 넣어주면 핵 없이도 진주를 스스로 만들어내는 방법이 알려져서 이런 방법으로 진주를 양식합니다.<p class="se-text-paragraph se-text-paragraph-align- " id="SE-440e24d3-2e3b-4d27-a37f-eab94a5a8630" style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 0px; line-height: 1.8; font-family: se-nanumgothic, sans-serif; vertical-align: baseline; word-break: break-word; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(0, 0, 0);"><span class="se-fs- se-ff- " id="SE-e260204f-a8e6-435c-ae80-5b12327b176a" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; vertical-align: baseline;">기본적으로 진주조개가 진주조개를 만드는 방법은 외투막의 상피조직이 여러가지 원인에 의해서 함입되어 진주주머니가 생겨나고 여기서 진주가 자라나게 됩니다<p class="se-text-paragraph se-text-paragraph-align- " id="SE-440e24d3-2e3b-4d27-a37f-eab94a5a8630" style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 0px; line-height: 1.8; font-family: se-nanumgothic, sans-serif; vertical-align: baseline; word-break: break-word; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(0, 0, 0);"><span class="se-fs- se-ff- " style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; vertical-align: baseline;"> <p class="se-text-paragraph se-text-paragraph-align- " id="SE-440e24d3-2e3b-4d27-a37f-eab94a5a8630" style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 0px; line-height: 1.8; font-family: se-nanumgothic, sans-serif; vertical-align: baseline; word-break: break-word; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(0, 0, 0);"><span class="se-fs- se-ff- " style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; vertical-align: baseline;"> <p class="se-text-paragraph se-text-paragraph-align- " style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 0px; line-height: 1.8; font-family: se-nanumgothic, sans-serif; vertical-align: baseline; word-break: break-word; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(0, 0, 0); text-align: center;"><img src="https://t1.daumcdn.net/cfile/cafe/993EAE3A5E6057F801" class="txc-image" hspace="1" vspace="1" border="0" actualwidth="419" width="419" exif="{}" data-filename="진주조개2.png" style="clear:none;float:none;" id="A_993EAE3A5E6057F801D04B"/><p class="se-text-paragraph se-text-paragraph-align- " id="SE-440e24d3-2e3b-4d27-a37f-eab94a5a8630" style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 0px; line-height: 1.8; font-family: se-nanumgothic, sans-serif; vertical-align: baseline; word-break: break-word; overflow-wrap: break-word; white-space: pre-wrap; color: rgb(0, 0, 0);"><span class="se-fs- se-ff- " style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; vertical-align: baseline;">