Scientific figure legend generator

A good legend lets the figure stand alone. The generator orders the elements the way most journals expect: a bold title stating the result, then each panel, then how the data are summarised and what $n$ means, the statistical test with any multiple-comparison correction, the significance thresholds, scale bars and abbreviations. Error bars are always defined (SD and SEM are not interchangeable), and replicates are described as biological or technical.

Two legends assembled by the generator, one in each journal style. Replace the placeholders (drug X, gene Y) with your own details.

Nature style (the example loaded in the tool):

Fig. 1 | Drug X reduces tumour growth in a xenograft model. a, Representative bioluminescence images of mice 21 days after implantation, treated with vehicle or drug X. b, Tumour volume over time. c, Ki-67 immunostaining of tumour sections. Data are presented as mean ± s.e.m.; n = 8 mice per group. Results are representative of three independent experiments. Statistical significance was determined by two-way repeated-measures ANOVA with Šidák’s multiple-comparisons test. *P < 0.05, **P < 0.01, ***P < 0.001; NS, not significant. Scale bars, 50 µm.

Cell style, for a cell-culture experiment or a lab report:

Figure 2. Knockdown of gene Y slows cell proliferation. (A) Western blot of protein Y in cells treated with control or gene Y siRNA. (B) Cell number over 72 h. (C) Doubling time calculated from the exponential growth phase. Data are presented as mean ± s.d.; n = 3 biological replicates. Statistical significance was determined by two-tailed unpaired t-test. *P < 0.05, **P < 0.01.

Both follow the same order: a title that states the finding, one sentence per panel, how the data are summarised and what $n$ counts, the statistical test and significance levels, then scale bars.