part_of part of part of entry into host symbiont entry into host anatomical structure formation involved in morphogenesis formation of infection structure Note that this term should not be used to annotate gene products of the host. It should only be used to annotate those gene products of the symbiont involved in this process. formation of host infection structure biological_process formation of host penetration structure GO:0075015 formation of infection structure on or near host The formation of a symbiont structure that serves to infect its host organism. It includes physiological, developmental, and morphological changes of the symbiont. The host is defined as the larger of the organisms involved in a symbiotic interaction. formation by symbiont of infection structure on or near host