FAQ: What K. lactis protease deletion strains does NEB sell?

NEB sells four protease deletion strains:

NEB #C1003S: strain YCT569 (ΔKLLA0D01507g)
NEB #C1004S: strain YCT389 (Δyps1)
NEB #C1005S: strain YCT390 (Δyps7)
NEB #C1006S: strain YCT598 (Δbar1)

Each strain is sold in a frozen competent cell format and is ready to be transformed by any pKLAC-series or pKLMF-series vector. Additionally, NEB sells a sampler pack that combines one competent cell transformation reaction for each strain (NEB #C1007S).