She also scrutinised a 'mottled' mutant, which had a different effect on male and female mice: male embryos sometimes died, and the surviving males had white coats, but females lived and were variegated.
Tamén examinou o mutante 'mottled' (de pintas), que tiña un efecto diferente en machos e femias de rato: os embrións masculinos ás veces morrían e os machos superviventes tiñan pelame branco, pero as femias normalmente vivían e eran variegadas.