i am looking for anyone who has, and is willing to share, a s. cerevisiae strain lacking the ENA1/PMR2 genes. i need this strain in order to characterize a p. carinii protein that i believe is involved in Na+ transport. (p. carinii is NOT easy to deal with in culture, so a model is important.) please email me at: jftreml at worldnet.att.net thanks, jack