Iba1 vs. VGLUT | | |

P6 | | |

Wild type | VCN | Pearson’s *r* = 0.781; *p* = 0.038; *n* = 7 |

Wild type | MNTB | Pearson’s *r* = 0.818; *p* = 0.013; *n* = 8 |

Wild type | LSO | Pearson’s *r* = 0.664; *p* = 0.073; *n* = 8 |

*Fmr1* KO | VCN | Pearson’s *r* = 0.386; *p* = 0.271; *n* = 10 |

*Fmr1* KO | MNTB | Pearson’s *r* = 0.793; *p* = 0.001; *n* = 13 |

*Fmr1* KO | LSO | Pearson’s *r* = 0.305; *p* = 0.310; *n* = 13 |

P14 | | |

Wild type | VCN | Pearson’s *r* = –0.179; *p* = 0.620; *n* = 10 |

Wild type | MNTB | Pearson’s *r* = 0.493; *p* = 0.148; *n* = 10 |

Wild type | LSO | Pearson’s *r* = –0.036; *p* = 0.921; *n* = 10 |

*Fmr1* KO | VCN | Pearson’s *r* = 0.176; *p* = 0.515; *n* = 16 |

*Fmr1* KO | MNTB | Pearson’s *r* = –0.039; *p* = 0.887; *n* = 16 |

*Fmr1* KO | LSO | Pearson’s *r* = –0.392; *p* = 0.133; *n* = 16 |

Iba1 vs. VGAT | | |

P6 | | |

Wild type | VCN | Pearson’s *r* = 0.119; *p* = 0.799; *n* = 7 |

Wild type | MNTB | Pearson’s *r* = 0.737; *p* = 0.037; *n* = 8 |

Wild type | LSO | Pearson’s *r* = 0.236; *p* = 0.574; *n* = 8 |

*Fmr1* KO | VCN | Pearson’s *r* = 0.0006; *p* = 0.999; *n* = 10 |

*Fmr1* KO | MNTB | Pearson’s *r* = 0.695; *p* = 0.008; *n* = 13 |

*Fmr1* KO | LSO | Pearson’s *r* = 0.130; *p* = 0.673; *n* = 13 |

P14 | | |

Wild type | VCN | Pearson’s *r* = 0.097; *p* = 0.789; *n* = 10 |

Wild type | MNTB | Pearson’s *r* = 0.149; *p* = 0.682; *n* = 10 |

Wild type | LSO | Pearson’s *r* = –0.292; *p* = 0.412; *n* = 10 |

*Fmr1* KO | VCN | Pearson’s *r* = 0.165; *p* = 0.541; *n* = 16 |

*Fmr1* KO | MNTB | Pearson’s *r* = –0.345; *p* = 0.190; *n* = 16 |

*Fmr1* KO | LSO | Pearson’s *r* = –0.401; *p* = 0.124; *n* = 16 |

Iba1 vs. Synaptophysin | | |

P6 | | |

Wild type | VCN | Pearson’s *r* = 0.422; *p* = 0.346; *n* = 7 |

Wild type | MNTB | Pearson’s *r* = 0.006; *p* = 0.989; *n* = 7 |

Wild type | LSO | Pearson’s *r* = 0.605; *p* = 0.150; *n* = 7 |

*Fmr1* KO | VCN | Pearson’s *r* = 0.281; *p* = 0.500; *n* = 8 |

*Fmr1* KO | MNTB | Pearson’s *r* = 0.231; *p* = 0.582; *n* = 8 |

*Fmr1* KO | LSO | Pearson’s *r* = 0.203; *p* = 0.629; *n* = 8 |

P14 | | |

Wild type | VCN | Pearson’s *r* = –0.115; *p* = 0.751; *n* = 10 |

Wild type | MNTB | Pearson’s *r* = 0.346; *p* = 0.328; *n* = 10 |

Wild type | LSO | Pearson’s *r* = 0.151; *p* = 0.676; *n* = 10 |

*Fmr1* KO | VCN | Pearson’s *r* = 0.565; *p* = 0.113; *n* = 9 |

*Fmr1* KO | MNTB | Pearson’s *r* = –0.057; *p* = 0.884; *n* = 9 |

*Fmr1* KO | LSO | Pearson’s *r* = –0.729; *p* = 0.026; *n* = 9 |