( ( In ( ( ( ( the bottom ) , ) or ) basal ) ) ( , ( ( layer ( of ( the epidermis ) ) ) ( ( immature ( ( skin cells ) ( called ( keratinocytes ( are produced ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT the) (NN bottom)) (, ,) (CC or) (NP (NN basal)))) (, ,) (NP (NP (NN layer)) (PP (IN of) (NP (DT the) (NNS epidermis)))) (VP (VBP immature) (SBAR (S (NP (NN skin) (NNS cells)) (VP (VBD called) (SBAR (S (NP (NNS keratinocytes)) (VP (VBP are) (VP (VBN produced))))))))) (. .)))
In the bottom, or basal, layer of the epidermis immature skin cells called keratinocytes are produced.
(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))))))) (. .)))