Hi to everybody

Below the dataset

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input str3 Litter str6 Strain str3 Strain_old byte Pnd double(Peso Temperatura)
"1B"  "B6_2"   "B6"   2   .    .
"2B"  "B6_2"   "B6"   2 1.1 27.6
"3B"  "B6_2"   "B6"   2 1.2 26.8
"4B"  "B6_2"   "B6"   2 2.6 29.3
"5B"  "B6_2"   "B6"   2 1.3 30.3
"6B"  "B6_2"   "B6"   2 1.5 27.7
"7B"  "B6_2"   "B6"   2 1.3 29.5
"8B"  "B6_2"   "B6"   2 1.3 28.1
"1B"  "B6_4"   "B6"   4 1.8 30.5
"2B"  "B6_4"   "B6"   4 1.6 29.6
"3B"  "B6_4"   "B6"   4 1.6 30.6
"4B"  "B6_4"   "B6"   4 1.7 30.4
"5B"  "B6_4"   "B6"   4 1.9 31.2
"6B"  "B6_4"   "B6"   4 2.3 32.1
"7B"  "B6_4"   "B6"   4 2.2 30.8
"8B"  "B6_4"   "B6"   4   2 31.8
"1B"  "B6_6"   "B6"   6 2.6 31.4
"2B"  "B6_6"   "B6"   6 2.2 31.4
"3B"  "B6_6"   "B6"   6 2.3 31.5
"4B"  "B6_6"   "B6"   6 2.6 30.2
"5B"  "B6_6"   "B6"   6 2.6 31.2
"6B"  "B6_6"   "B6"   6 3.3 32.5
"7B"  "B6_6"   "B6"   6 3.2 31.7
"8B"  "B6_6"   "B6"   6 2.9 32.5
"1B"  "B6_8"   "B6"   8 3.5 33.1
"2B"  "B6_8"   "B6"   8 2.9 31.7
"3B"  "B6_8"   "B6"   8 3.2 30.1
"4B"  "B6_8"   "B6"   8 3.3 32.7
"5B"  "B6_8"   "B6"   8 3.3 33.3
"6B"  "B6_8"   "B6"   8 4.5 31.8
"7B"  "B6_8"   "B6"   8 4.2 32.9
"8B"  "B6_8"   "B6"   8   4 32.4
"1B"  "B6_12"  "B6"  12 5.9 33.4
"2B"  "B6_12"  "B6"  12   5 32.9
"3B"  "B6_12"  "B6"  12 5.3 30.2
"4B"  "B6_12"  "B6"  12 4.7 33.5
"5B"  "B6_12"  "B6"  12 4.4 33.8
"6B"  "B6_12"  "B6"  12 6.7 34.4
"7B"  "B6_12"  "B6"  12 6.1 33.8
"8B"  "B6_12"  "B6"  12 5.9 34.3
"1F"  "FVB_2"  "FVB"  2 1.8 31.8
"2F"  "FVB_2"  "FVB"  2 1.6 29.7
"3F"  "FVB_2"  "FVB"  2 1.6 30.4
"4F"  "FVB_2"  "FVB"  2 1.8 30.3
"5F"  "FVB_2"  "FVB"  2 1.8 30.3
"6F"  "FVB_2"  "FVB"  2   2 29.7
"7F"  "FVB_2"  "FVB"  2 1.5 30.9
"8F"  "FVB_2"  "FVB"  2 1.8 30.8
"9F"  "FVB_2"  "FVB"  2 1.8 30.5
"10F" "FVB_2"  "FVB"  2 2.6 31.1
"1F"  "FVB_4"  "FVB"  4 2.6   31
"2F"  "FVB_4"  "FVB"  4 2.4 31.5
"3F"  "FVB_4"  "FVB"  4 2.1 31.3
"4F"  "FVB_4"  "FVB"  4 2.8 30.9
"5F"  "FVB_4"  "FVB"  4 2.6 31.1
"6F"  "FVB_4"  "FVB"  4 2.9 31.7
"7F"  "FVB_4"  "FVB"  4 2.2 30.8
"8F"  "FVB_4"  "FVB"  4 2.7 31.6
"9F"  "FVB_4"  "FVB"  4 2.6 30.8
"10F" "FVB_4"  "FVB"  4 3.6 31.3
"1F"  "FVB_6"  "FVB"  6 3.6 31.7
"2F"  "FVB_6"  "FVB"  6 3.4 32.1
"3F"  "FVB_6"  "FVB"  6 2.7 30.8
"4F"  "FVB_6"  "FVB"  6 3.8 32.5
"5F"  "FVB_6"  "FVB"  6 3.5 31.4
"6F"  "FVB_6"  "FVB"  6   4 32.6
"7F"  "FVB_6"  "FVB"  6 3.1 32.3
"8F"  "FVB_6"  "FVB"  6 3.5 32.8
"9F"  "FVB_6"  "FVB"  6 3.6 32.2
"10F" "FVB_6"  "FVB"  6 4.6 33.6
"1F"  "FVB_8"  "FVB"  8 4.3 33.4
"2F"  "FVB_8"  "FVB"  8 4.5 33.4
"3F"  "FVB_8"  "FVB"  8   3 30.8
"4F"  "FVB_8"  "FVB"  8   5 32.2
"5F"  "FVB_8"  "FVB"  8 4.2 32.1
"6F"  "FVB_8"  "FVB"  8 4.8 33.1
"7F"  "FVB_8"  "FVB"  8   4   32
"8F"  "FVB_8"  "FVB"  8 4.3 32.9
"9F"  "FVB_8"  "FVB"  8 4.5 33.5
"10F" "FVB_8"  "FVB"  8 5.6 33.8
"1F"  "FVB_12" "FVB" 12 5.7 33.9
"2F"  "FVB_12" "FVB" 12 6.1   34
"3F"  "FVB_12" "FVB" 12 3.5 31.5
"4F"  "FVB_12" "FVB" 12 6.2 34.1
"5F"  "FVB_12" "FVB" 12 6.1 33.4
"6F"  "FVB_12" "FVB" 12 6.4 34.6
"7F"  "FVB_12" "FVB" 12 5.2 33.7
"8F"  "FVB_12" "FVB" 12 5.8 34.3
"9F"  "FVB_12" "FVB" 12   6 34.6
"10F" "FVB_12" "FVB" 12 7.1 34.4
"1C"  "CD1_2"  "CD1"  2   2 30.7
"2C"  "CD1_2"  "CD1"  2 1.6 30.2
"3C"  "CD1_2"  "CD1"  2 1.8 30.9
"4C"  "CD1_2"  "CD1"  2   2 29.3
"5C"  "CD1_2"  "CD1"  2 1.8 28.7
"6C"  "CD1_2"  "CD1"  2 2.2 29.9
"7C"  "CD1_2"  "CD1"  2 2.6 30.2
"8C"  "CD1_2"  "CD1"  2 1.7 30.2
"9C"  "CD1_2"  "CD1"  2 2.1 31.1
"10C" "CD1_2"  "CD1"  2 2.7 30.7
end

I use the code that a member of the Forum suggested to me:

gen label = substr(Strain, strpos(Strain, "_") + 1, .)

gen axis = sum(Strain != Strain[_n-1]) + sum(Strain_old != Strain_old[_n-1]) - 1

labmask axis, values(label)

set scheme s1color

stripplot Peso, over(axis) box centre vertical xtitle("") xmla(3 "B6" 9 "FVB" 15 "CD1", tlength(*7) tlc(none) labsize(medlarge)) yla(, ang(h)) separate(Strain_old) ms(Oh ..) mcolor(grey green blue) legend(off) xsc(r(. 17)) xli(6 12, lc(gs8) lw(thin))


However, this code group by types of mice (B6, FVB, CD1). IF I WANTED TO GROUP FOR TIMEPOINT (2, 4 ,6 ,8 ,12)?
In practice I should get a figure like the one I attach but using "stripplot" Thanks to everybody