  The structure of self-bound one-dimensional droplets containing a mixture of
Ytterbium fermionic isotopes ($^{173}$Yb, $^{171}$Yb) is calculated by means of
a diffusion Monte Carlo technique. We considered only balanced setups in which
all the atoms of one isotope are spin-polarized, while the atoms of the other
can have up to three different spin values, that difference being a necessary
requirement to achieve stable systems. Our results indicate that these droplets
consist of consecutive "molecules" made up of one $^{173}$Yb and one $^{171}$Yb
atom. In other words, we have up to three different kinds of composite bosons,
corresponding to the number of spin components in the non-polarized isotope.
The fermionic nature of those Yb atoms makes pairs with identical spin
composition avoid each other, creating a Pauli-like-hole filed by another
molecule in which at least one of the Yb atoms has a different spin from that
of their closest neighbors. This effective repulsion is akin to an
antiferromagnetic short-range interaction between different kinds of composite
bosons.
