ASY	Aberrant six-year samples
DEGs	Differentially expressed genes
FDR	False discovery rate
FPKM	Kilobase of transcript per million fragments mapped
FY	Four-year samples
GO	Gene Ontology
HCA	Hierarchical cluster analysis
KEGG	Kyoto Encyclopedia of Genes and Genomes
Nr	NCBI non-redundant protein sequences
OPLS-DA	Orthogonal partial least squares-discriminant analysis
PCA	Principal component analysis
SY	Six-year samples
TFs	Transcription factors
UPLC–ESI–MS/MS	Ultra-performance liquid chromatography-electrospray ionization-tandem mass spectrometry
VIP	Variable importance in projection