Table 3.

Proteins Associated with the Ubiquitin-Proteasome Pathway of Protein Degradation Which Were Identified in T47D Parent Cells But Not in T47DRR Cells Using LC-MALDI-TOF/TOF MS.

Protein	NCBI Accession	Gene	Known/Proposed Function	Total Ion Score	Total Ion CI (%)
Proteasome alpha 1 subunit, isoform 2	16307002	PSMA1	Protein degradation	80	100
26S proteasome subunit p40.5	3618343	PSMD13	Protein degradation	65	99.997
Proteasome (prosome, macropain) subunit, beta type, 2	30583113	PSMB2	Protein degradation	41	99.322
Ubiquitin-associated protein 2-like	13111995	UBAP2L	Ubiquitin cycle	100	100
Hyd protein (ubiquitin protein ligase E3 component n-recognin 5	9545980	UBR5	Ubiquitin cycle	44	99.626