Select samples to perform DiffCodon Occupancy analysis:

• 1. DiffCodon Occupancy is a commonly used metric in genomics and transcriptomics research, reflecting the differences in the frequency of usage of different codons during transcription;
• 2. E/P/A typically represent different categories of codon usage bias:

E (Essential): Represents the codon usage bias that is closely related to the essential amino acids for the basic physiological functions of an organism, playing a critical role in the structure and function of proteins.

P (Proteinogenic): Represents the codon usage bias that is associated with the common amino acids for protein synthesis, playing an important role in protein synthesis in an organism.

A (Additional): Represents the codon usage bias that is related to other amino acids, usually minor or rare ones synthesized by an organism.