Tissue Manual | Labeling Tissue Cap Inserts

Labeling Tissue Cap Inserts

Nalgene caps for standard MVZ tissue vials accommodate color-coded inserts that are used to label the collection. The collection is color-coded as follows:

      • Birds – white
      • Mammals – yellow
      • Herps – green

After specimens and tissues have been cataloged for an accession, tissue vial cap inserts should be labeled with the MVZ catalog number and the collector initial plus number using a “Cancer” pen as follows:

      1. Write the MVZ number (e.g., 191967) just below the semi-circle hole in the insert
      2. Draw a line below that number
      3. Write the collector’s initials and number below the line (e.g., DRW 174)

Because the collector’s initials and number are written on the vial, adding this information on the cap insert allows matching of the cap and correct MVZ number with the vial in case of inadvertent mixing.

If there are multiple vials for a given specimen, add a single dot above the hole for the first sample, 2 dots for the second sample, 3 dots for the third sample, and so on. If the multiple vials have different preservation methods, the first dot should be given to tissue that was preserved frozen (e.g., in liquid nitrogen, if relevant) and subsequent dot(s) to other samples with a different preservation method (e.g., RNAlater). Do not add any dots if there is only one vial per specimen.

If there are multiple inserts to write, it’s best to do them all at once before inserting then into the vial cap. To keep them in order, use wide packing tape and put a large piece that’s rolled to stick front and back onto a piece of cardboard (e.g., and old broken skin tray or any other cardboard). Stick the inserts onto the tape in the order of the cataloged samples.

Adding Inserts to Tissue Caps

When ready to add labeled tissue inserts into vial caps, find the correct vial (make sure it matches the data!) and align the insert with the writing on the vial. The orientation of the writing on the cap insert should be parallel (more or less) to the writing on the side of the vial, so that it is easy to read both the insert and side without having to rotate the vial. Carefully put the insert into the indented part of the cap, making sure that it goes down evenly so that the insert is flush with the vial cap all around. Use forceps (or any other similar tool) to remove ice from the inside of the cap before adding the insert, if necessary.