In more complex animals, specialized receptor cells such as chemoreceptors and photoreceptors are found in groups and send messages along neural networks to other parts of the organism.
ɪn mˈoːɹ kˈɑːmplɛks ˈænɪməlz, spˈɛʃəlˌaɪzd ɹᵻsˈɛptɚ sˈɛlz sˈʌtʃ ɐz kˌiːmoʊɹˈɛsɛptɚz ænd fˌoʊɾoʊɹᵻsˈɛptɚz ɑːɹ fˈaʊnd ɪn ɡɹˈuːps ænd sˈɛnd mˈɛsɪdʒᵻz ɐlˈɔŋ nˈʊɹɹəl nˈɛtwɜːks tʊ ˈʌðɚ pˈɑːɹts ʌvðɪ ˈɔːɹɡənˌɪzəm.