Figure 3. The six hybrid species.
Each of the hybrids (see cartoons in Fig. 1 for nomenclature) was analyzed by sodium dodecyl (14%) polyacrylamide gel electrophoresis. The samples in the first 6 lanes (reduced) were boiled 5 min. in sample buffer containing 1% SDS and 20 mM DTT before loading. Those in the 6 lanes on the right were boiled in sample buffer containing 1% SDS without DTT, but with 1 mM NEM (N-ethylmaleimide), which reacts with any free sulfhydryls, to avoid oxidative crosslinking.