update column names

pyrat-data-mixed-mutations.csv

@@ -1,4 +1,4 @@
-ID,Line / Strain (Name),DOB,Father 1,Mother 1,Sacrifice reason,Mutation 1,Grade 1,Mutation 2,Grade 2,Mutation 3,Grade 3,Father 1: Mutation 1,Father 1: Grade 1,Father 1: Mutation 2,Father 1: Grade 2,Father 1: Mutation 3,Father 1: Grade 3,Mother 1: Mutation 1,Mother 1: Grade 1,Mother 1: Mutation 2,Mother 1: Grade 2,Mother 1: Mutation 3,Mother 1: Grade 3
+ID,Line / Strain (Name),DOB,Father,Mother,Sacrifice reason,Mutation 1,Grade 1,Mutation 2,Grade 2,Mutation 3,Grade 3,Father: Mutation 1,Father: Grade 1,Father: Mutation 2,Father: Grade 2,Father: Mutation 3,Father: Grade 3,Mother: Mutation 1,Mother: Grade 1,Mother: Mutation 2,Mother: Grade 2,Mother: Mutation 3,Mother: Grade 3
 ID-001,Line-AB,15/12/2025,ID-F1,ID-M1,End of experiment,Mut-A,hom,Mut-B,hom,,,Mut-A,het,Mut-B,hom,,,Mut-A,hom,Mut-B,het,,
 ID-002,Line-AB,15/12/2025,ID-F1,ID-M1,End of experiment,Mut-A,hom,Mut-B,hom,,,Mut-A,het,Mut-B,hom,,,Mut-A,hom,Mut-B,het,,
 ID-003,Line-AB,02/01/2025,ID-F1,ID-M1,End of experiment,Mut-A,het,Mut-B,hom,,,Mut-A,het,Mut-B,hom,,,Mut-A,hom,Mut-B,het,,