know very little about the field in which you are working. Therefore,
you must be explicit, detailed, but yet concise as you describe the
thought processes underlying each experiment. In essence, walk the
reviewer through each experiment starting with why the experiment
was performed, how the experiment was performed, what the results
looked like, and the conclusions drawn from these results.
The following rubric can serve as a model for the construction of
each individual paragraph of the Preliminary Data section. First, tell
the reader exactly what the purpose of the experiment is, how it
derived from literature evidence or unpublished data, and how it
relates to the hypothesis or model system. “Literature evidence sug-
gests that phosphorylation of the transcription factor is important for
regulating differentiation. However, to date, no experiments have been
performed to test this idea. Therefore, to determine how phosphoryla-
tion at specific sites affects the functions of the transcription factor we
tested the ability of different phospho-mutants to alter DNA binding.”
Once you have established the reason for performing the experiment,
provide them with just enough information, usually one to three
sentences, to understand how the experiment was performed. This
description does not need to include minute details, such as buffers
used or concentrations of reagents, but should contain broader strokes
that include the experimental system used, the read out that provided
the data, and how the data was analyzed.
After discussing the experimental system you next want to describe
the results of the experiment. Do not assume that the reviewer will
understand or be able to interpret the data simply by looking at your
figure! Too many times an applicant will simply write “As evident in
Figure X, treatment of cells with the drug inhibits differentiation,”
without providing an explanation of what the figure is showing, what
the control is, what differentiation of this cell type looks like, etc. As
stated repeatedly, the reviewer will most likely not be versed in your
field of research, let alone be able to interpret data without at least a
minimal explanation. Making the assumption that the reader may
have an expertise that they might not truly have will only frustrate and
anger your reviewer. Therefore, be sure to describe the data to the
reader so they can make an intelligent evaluation of the data for them-
selves. Also, it is important to point out exactly what it is about the
results that you want the reviewer to focus on. For example, “We
observed the elongation of cells with fusion into multinucleated
82 A Practical Guide to Writing a Ruth L. Kirschstein NRSA Grant