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You can get there from Bordeaux by combining the train (Bordeaux–Arcachon line; alight at Cestas Gazinet station) and then the shuttle bus Prox’ Bus, which will drop you off at INRAE in Cestas Pierroton (two departures in the morning from Gazinet: 8.26 am and 9 am; two departures in the evening from Pierroton: 5.15 pm and 6.10 pm). The PGTB is located in the Artiga building.