May play a role in transmitting a signal which both protects non-diapause eggs from cold injury and terminates diapause in diapause eggs. Binds to HSP70. Expressed at high levels in chilled diapause eggs and to a lesser extent in chilled non-diapause eggs. In diapause eggs, expressed after chilling at 5 degrees Celsius for 5-6 days, persists for 30 days and then decreases. By cold. 'Samui' means 'cold' in Japanese.