Refer to the figure showing the pathways of microRNAs and siRNAs. 
What is structure B and what is it composed of?
Definitions:
Legal Immigration
The process through which individuals relocate to another country in accordance with the host country's laws and regulations.
Amnesty Program
A governmental initiative that grants legal forgiveness for individuals who have committed certain offenses, often related to immigration or taxes, permitting them to rectify their status or reduce penalties.
Legal Immigrants
Individuals who have been granted the right to live permanently and work in a country according to its laws and procedures.
Country of Origin
Refers to the country where a product is manufactured or where a service is provided, often used to indicate quality, style, or prestige.
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