lˈaɪk mˌaɪɾəkˈɑːndɹiə, ðeɪ hæv ɐ dˈʌbəl mˈɛmbɹeɪn ænd mˈoʊst pɹˈoʊtiːnz ɑːɹ dᵻlˈɪvɚd tə ðˌɛm baɪ ɐ tˈɑːɹɡɪɾɪŋ sˈiːkwəns ʌv ɐmˈiːnoʊ ˈæsɪdz.
Like mitochondria, they have a double membrane and most proteins are delivered to them by a targeting sequence of amino acids.