41. The gene appears to be under strong purifying selection. 42. Inventors were also developing air purifying devices in Europe. 43. Essentially an agricultural festival, the Thargelia included a purifying and expiatory ceremony. 44. Ngoma has a borehole so the water does not need boiling or purifying . 45. The cost of purifying it for human consumption makes that process less feasible. 46. There are several methods for purifying and isolating honokiol. 47. Holy dip in the Mansar Lake is assumed to be purifying the sins. 48. The characters wash their hands, purifying themselves in the context of catharsis. 49. The purifying herbal medicine is accompanied by scratching of the participants bodies. 50. Purifying baths were common in many rituals across the Greco-Roman world.