Fig. 4.

“What kind of separation technique does your laboratory use in tandem with mass spectrometry for lipidomics (select those that apply)?” The values are shown as a percentage of total responses (total number of laboratories responding, n = 125). The overall total number of responses was 319. The number of responses are indicated in the figure above the solid bars. The x axis labels reflect the survey multiple choice response options. Note that for this question, laboratories had the option to self-identify with more than one option. Write-in responses included thin-layer chromatography, matrix assisted laser desorption/ionization (MALDI), and imaging