1. INTRODUCTION

2. THE DATA: NEXT GENERATION VIRGO SURVEY GCS
2.1. Colors and magnitudes
2.2. Relative ages and metallicities
2.3. Stellar color homogeneity

3. RESULTS

4. DISCUSSION
4.1. Significance of the GC substructure detection
4.2. An astrophysical origin of the GC substructure?

5. CONCLUSION