( ( ( ( The top ) & ) ( bottom layers ) ) ( ( ( are both ) ( referred ( to ( ( ( as an ) epidermis ) ( -LRB- ( ( outer layer ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN top)) (CC &) (NP (JJ bottom) (NNS layers))) (VP (VBP are) (ADVP (DT both)) (VP (VBN referred) (PP (TO to) (NP (NP (QP (RB as) (DT an)) (NNS epidermis)) (PRN (-LRB- -LRB-) (NP (JJ outer) (NN layer)) (-RRB- -RRB-)))))) (. .)))
The top &amp; bottom layers are both referred to as an epidermis (outer layer).
(ROOT (S (NP (NNS Melanocytes)) (VP (VBP are) (VP (VBN located) (PP (IN in) (NP (NP (DT the) (JJ bottom) (NN layer)) (PP (IN of) (NP (DT the) (NNS epidermis))))))) (. .)))