  We identify the local scaling limit of multiple boundary-to-boundary branches
in a uniform spanning tree (UST) as a local multiple SLE(2), i.e., an SLE(2)
process weighted by a suitable partition function. By recent results, this also
characterizes the "global" scaling limit of the full collection of full curves.
The identification is based on a martingale observable in the UST with $N$
branches, obtained by weighting the well-known martingale in the UST with one
branch by the discrete partition functions of the models. The obtained
weighting transforms of the discrete martingales and the limiting SLE
processes, respectively, only rely on a discrete domain Markov property and
(essentially) the convergence of partition functions. We illustrate their
generalizability by sketching an analogous convergence proof for a
boundary-visiting UST branch and a boundary-visiting SLE(2).
