Quantification of the polarity index of the S1935 mutants
| Endogenous MHCII-B depletion | Rescued with | Polarity index ± SD | P-value |
| No (control) | N/A | 2.23 ± 0.81 | <0.01b |
| Yes | No (MHCII-B knockdown) | 1.24 ± 0.19 | <0.01a |
| Yes | GFP–MHCII-B wild type (rescue) | 2.01 ± 0.54 | <0.01b |
| Yes | GFP–MHCII-B 1935A | 2.06 ± 0.65 | <0.01b |
| Yes | GFP–MHCII-B 1935D | 1.35 ± 0.29 | <0.01a |
| Yes | GFP–MHCII-B ADDDD | 1.95 ± 0.73 | <0.01b |
| Yes | GFP–MHCII-B DAAAA | 1.36 ± 0.32 | <0.01a |
| Endogenous MHCII-B depletion | Rescued with | Polarity index ± SD | P-value |
| No (control) | N/A | 2.23 ± 0.81 | <0.01b |
| Yes | No (MHCII-B knockdown) | 1.24 ± 0.19 | <0.01a |
| Yes | GFP–MHCII-B wild type (rescue) | 2.01 ± 0.54 | <0.01b |
| Yes | GFP–MHCII-B 1935A | 2.06 ± 0.65 | <0.01b |
| Yes | GFP–MHCII-B 1935D | 1.35 ± 0.29 | <0.01a |
| Yes | GFP–MHCII-B ADDDD | 1.95 ± 0.73 | <0.01b |
| Yes | GFP–MHCII-B DAAAA | 1.36 ± 0.32 | <0.01a |