part_of part of part of anatomical structure morphogenesis developmental process anatomical structure formation involved in morphogenesis formation of an anatomical structure involved in morphogenesis The developmental process pertaining to the initial formation of an anatomical structure from unspecified parts. This process begins with the specific processes that contribute to the appearance of the discrete structure and ends when the structural rudiment is recognizable. An anatomical structure is any biological entity that occupies space and is distinguished from its surroundings. Anatomical structures can be macroscopic such as a carpel, or microscopic such as an acrosome. GO:0048646 biological_process