The phrase "mutant embryos" refers to embryos that have genetic abnormalities or mutations, meaning they have changes in their DNA that can cause differences or problems in their development. Full definition
To determine what aspects of mesodermal cell migration are affected in toddler mutants, we tracked migrating drl: eGFP - positive ventrolateral mesodermal cells (Mosimann et al., 2015) in wild - type and toddler mutant embryos during gastrulation using light sheet microscopy (Figure 5C and Video 1). (elifesciences.org)
Antibody staining also shows increased phosphorylation of the Nodal signal transducer, Smad2, in lefty2 mutant embryos as compared to wild - type embryos (Author response image 1)(Dubrulle et al. 2015; Schier 2009). (elifesciences.org)
Homozygous null bmp7 or bmp2b mutant embryos were obtained from crosses between bmp7 or bmp2b heterozygous zebrafish. (jci.org)