However, Richard Ebright and coworkers, using fluorescence resonance energy transfer, later showed that the σ does not obligatorily leave the core.
The O'Reilly Factor | The X Factor (UK) | Microphthalmia-associated transcription factor | The X Factor | Sigma Chi | Fear Factor | Sigma Xi | Sigma Alpha Epsilon | Max Factor | Delta Sigma Theta | The X Factor (TV series) | B-cell activating factor | Phi Beta Sigma | Epidermal growth factor receptor | Sigma Corporation | Sigma Alpha Mu | Sigma Phi Epsilon | Sigma | Psi Factor: Chronicles of the Paranormal | Kappa Sigma | Beta Gamma Sigma | Astro Boy: Omega Factor | Tau Beta Sigma | Six Sigma | Sigma Alpha Iota | Phi Sigma Kappa | twist transcription factor | The X Factor (U.S.) | The X Factor (UK TV series) | The X Factor (UK series 2) |