There are several mechanisms for horizontal gene transfer:
ð ɛ ɹ ɑ ɹ WORD_BOUNDARY s ɛ v ɹ ə l WORD_BOUNDARY m ɛ k ə n ɪ z ə m z WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY h ɔ ɹ ɪ z ɔ n t ə l WORD_BOUNDARY d̠ʒ iː n WORD_BOUNDARY t ɹ æ n s f ɜː WORD_BOUNDARY