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A recent review paper covers the use of AM to produce bio-inspired structures with the main aim to learn about and optimize the biological structures themselves .
 manufacturing process: AM; engineering feature: bio-inspired structures; engineering feature: biological structures
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 manufacturing process: AM; engineering feature: bio-inspired structures; engineering feature: biological structures