PCC1	Proanthocyanidin C1
GSE	Grape seed extract
NSPCC1	Natural Senolytics PCC1
IL-6	Interleukin-6
TNF-α	Tumor Necrosis Factor α
CRP	C-reactive protein
HSCs	Hematopoietic stem cells
DNA	Deoxyribonucleic acid
NF-κB	Nuclear Factor Kappa B
SD rats	Sprague Dawley rats
Y-Veh	Young—Vehicle
O-Veh	Old—Vehicle
O-NSPCC1	Old—Natural Senolytics PCC1
TBI	Total body irradiation
RBC	Red blood cell
HGB	Hemoglobin
HCT	Hematocrit
GSH	Reduced glutathione
GSSG	Oxidized glutathione
T-GSH	Total glutathione
BM	Bone marrow
CD4	Cluster of Differentiation 4
CD8	Cluster of Differentiation 8
B220	B-cell marker 220
CD11b	Cluster of Differentiation 11b
Gr-1	Granulocyte-1
TER119	Ter119 antigen
IL-7R	Interleukin-7 Receptor
FLT3	Fms-like Tyrosine Kinase 3
CD150	Cluster of Differentiation 150
CD48	Cluster of Differentiation 48
Sca-1	Stem Cell Antigen-1
c-Kit	KIT proto-oncogene receptor tyrosine kinase
CD16/32	Cluster of Differentiation 16/32
CD34	Cluster of Differentiation 34
CFU	Colony-Forming Unit
BFU-E	Burst-Forming Unit—Erythroid
CFU-GM	Colony-Forming Unit—Granulocyte/Macrophage
CFU-GEMM	Colony-Forming Unit—Granulocyte/Erythrocyte/Macrophage/Megakaryocyte
H&E	Hematoxylin and eosin staining
BSA	Bovine serum albumin
DAB	Diaminobenzidine
LC-MS	Liquid chromatography–mass spectrometry
AUC	Area under the curve
Cmax	Maximum plasma concentration
Tmax	The time to maximum concentration
HSPCs	Hematopoietic stem and progenitor cells
qPCR	Quantitative polymerase chain reaction
CCL2/CCR2	C-C Motif Chemokine Ligand 2/C-C Motif Chemokine Receptor 2
IL-1β	Interleukin-1β
TGF-β/Smad3	Transforming Growth Factor-beta/Smad3
F4/80	EGF-like Module-containing Mucin-like Hormone Receptor-like 1
iNOS	Inducible nitric oxide synthase
PCA	Principal component analysis
DEGs	Differentially expressed genes
KEGG	Kyoto Encyclopedia of Genes and Genomes
GO	Gene Ontology
MEPs	Megakaryocyte–erythroid progenitors
LSKs	Lineage-Sca-1+c-Kit+ cells
CLPs	Common lymphoid progenitors