Rationale for this happening in the CHR?  because it reqs Atm??

Atm--

  *** Mdc1[phosAb] phos(T719)[phosAb] is unchanged irt IR (tnr)
    *** cells: AT22IJET<Atm~fmut> in BMS
    *** source: 18006705-Fig-1c

phos on TQXF motif

  *** Mdc1[phosAb] phos(T719)[phosAb] is increased irt IR (10 min)
    *** cells: U2OS<Mdc1~kd><xMdc1> in BMS
    *** inhibited by: xMdc1(679-778/T699A/T719A/T752A/T765A) [substitution]
    *** source: 18006705-Fig-S2b

chemicals

  *** Mdc1[phosAb] phos(T719)[phosAb] is increased irt IR (tnr)
    *** cells: U2OS in BMS
    *** inhibited by: KU55933 [addition]
    *** source: 18006705-Fig-1c

no extras

  *** Mdc1[phosAb] phos(T719)[phosAb] is increased irt IR (10 min)
    *** cells: U2OS in BMS
    *** source: 18006705-Fig-S2b

