6771
Additionally , the epitaxial grain growth from the adjacent laser tracks , previous layers , and partially melted nano-powders into the solidifying meltpool is observed along the highest heat flow directions .
 epitaxial, laser, melted, meltpool, heat
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 epitaxial, laser, melted, meltpool, heat