Version numbers are used to distinguish when something has changed in a probemix.
To make sure changes in a probemix are noticed by its users, MRC-Holland uses version numbers. The first version of a probemix is always called A1. A minor change to the contents of the probemix, such as adjustments in a probe’s length while the hybridising sequence remains the same, is indicated by a change in the number, such as A1 to A2. A major change, like the addition/removal of a target probe, is indicated by a change in the letter, such as A2 to B1. All changes made to a probemix are indicated in the probemix product description.
Probemixes also have a lot number that indicates the production batch. New versions will always have a new lot number, but there can be more than one lot for the same version.