Table 1. Porcine cumulus-oocyte complexes (COCs) proteins differentially expressed between good- and poor-quality groups were identified by matrix-assisted laser desorption ionization-time of flight analysis

Spot ID	Est'd Z1)	Accession No.	Protein information	Coverage%	pI	kDa
1	1.22	AAD19964.1	Tight junction protein ZO-2	9	4.3	62.02
2	1.72	P02554.1	Tubulin beta chain	35	5.8	53.41
3	1.4	XP_001363563.1	Similar to dynamin 1-like, isoform 4	29	5.2	65.48
4	2.43	XP_535489.2	Similar to meiosis-specific nuclear structural protein 1	13	5.4	65.3
5	1.57	CAA30943.1	Transferrin	33	7.8	39.38

Z scores and their corresponding percentiles in an estimated random-match population: [(Z: percentile) 1.282:90.0, 1.645:95.0, 2.326:99.0, 3.090:99.9].