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Let 
$X$ be a smooth projective curve of genus 
$g\geq 2$ over an algebraically closed field 
$k$ of characteristic 
$p>0$. We show that for any integers 
$r$ and 
$d$ with 
$0<r<p$, there exists a maximally Frobenius destabilised stable vector bundle of rank 
$r$ and degree 
$d$ on 
$X$ if and only if 
$r\mid d$.
We prove that, given a smooth projective curve C of genus g≥2, the forgetful morphism 
(respectively 
) from the moduli space of orthogonal (respectively symplectic) bundles to the moduli space of all vector bundles over C is an embedding. Our proof relies on an explicit description of a set of generators for the polynomial invariants on the representation space of a quiver under the action of a product of classical groups.
