special molecules carry messages from the cell membrane to the cell nucleus
secretory_cell is somatic_cell. cell_membrane_outer_surface is cell_part. cell_nucleus is nuclear_body. cell_membrane is cell_membrane_stuff. eukaryotic_messenger_rna_molecule is messenger_rna_molecule. human_somatic_cell_nucleus is cell_nucleus. somatic_cell_nucleus is cell_nucleus. embryonic_cell is cell. cell_nucleus is organelle.