Table 2. Proteins identified in the secretome of neonatal cardiac progenitor cells and the respective pathways involved.

Canonical pathways	Proteins
Protein Ubiquitination Pathway	HSPD1, PSMA3, HSPE1, UBE2D2, PSMD4, PSMA7, PSMD9, HSPA8, PSMB7, SKP1, TCEB1, PSMB3, PSMA1, HSP90AA1, PSMA5, USP14, PSMC3, UBE2N, PSME1, USO1, HSPA9, HLA-A, PSMB4, UBE2I, UCHL3, SUGT1, HLA-B, HSPH1, HSP90AB1
mTOR Signaling	EIF3G, RPS10, EIF4A2, EIF3B, RPS5, RPS20, PPP2R1A, EIF4A1, EIF4EBP1, VEGFC, EIF3J, EIF4G1, PPP2CA, EIF3A, RPS7, RPS2, PDGFC, RPS3, RPS12, RPSA, RPS16, MAPK1, EIF3K, RPS4X, EIF3C, EIF3F
ERK/MAPK Signaling	TLN1, CRKL, PPP1R12A, ITGA2, PPP1R7, PPP1CA, PXN, YWHAH, MAPK1, PPP2R1A, CRK, EIF4EBP1, PPP2CA
HIF-1α Signaling	MMP3, MMP9, TCEB1, MAPK1, MMP10, HSP90AA1, APEX1, VEGFC, PDGFC
PI3K/AKT Signaling	GDF15, ITGA2, PPP2R1A, MAPK1, HSP90AB1, HSP90AA1, YWHAH, EIF4EBP1, PPP2CA
HIPPO Signaling	PPP1R12A, PPP1R7, PPP1CA, SKP1, PPP2R1A, YAP1, YWHAH, PPP2CA
VEGF Signaling	EIF2S1, EIF2S2, ACTG1, PXN, MAPK1, EIF1, VEGFC, PDGFC
Neuregulin Signaling	CRKL, ITGA2, MAPK1, CRK, HSP90AB1, HSP90AA1
Telomerase Signaling	PTGES3, PPP2R1A, MAPK1, HSP90AB1, HSP90AA1, PPP2CA
Antiproliferative Role of TOB in T Cell Signaling	TGFB1, SKP1, PABPC1, MAPK1