Taken together, the spectral shift of the peaks and
the emission spectrum broadening allows for significant excitation into the optical window for intravital and whole - body imaging applications.
According to the shapes of the
emission spectra, the fluorescent proteins can be divided into two groups, i.e., Amrose v0, v2, and v4, and Amrose v1 and v3, respectively, with the
emission spectra of the former three proteins revealing a
broadening and red tail in comparison to the
emission band of Amrose v1 and v3.
(I'm guessing whoever wrote the text in the
broadening sections is more used to thinking about
emission spectra, and so got lazy and kept referring only to
emission.)