( ( ( ( ( ( ( Extracellular ( matrix components ) ) -LRB- ) ( primarily ( collagens ( , ( proteoglycans ( and ( adhesive glycoproteins ) ) ) ) ) ) ) -RRB- ) and ) ( dermal cell ) ) ( ( processes ( close ( to ( ( the ( epidermal ( basement membrane ) ) ) ( become ( ( ( distributed ( in ( a ( microheterogeneous fashion ) ) ) ) , ) ( thus ( providing ( ( a ( changing substratum ) ) ( for ( the ( overlying epidermis ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (JJ Extracellular) (NN matrix) (NNS components)) (-LRB- -LRB-) (NP (RB primarily) (NNS collagens) (, ,) (NNS proteoglycans) (CC and) (NN adhesive) (NNS glycoproteins)) (-RRB- -RRB-)) (CC and) (NP (JJ dermal) (NN cell))) (VP (VBZ processes) (ADJP (JJ close) (PP (TO to) (NP (NP (DT the) (JJ epidermal) (NN basement) (NN membrane)) (VP (VBN become) (S (VP (VBN distributed) (PP (IN in) (NP (DT a) (JJ microheterogeneous) (NN fashion))) (, ,) (S (ADVP (RB thus)) (VP (VBG providing) (NP (NP (DT a) (VBG changing) (NN substratum)) (PP (IN for) (NP (DT the) (VBG overlying) (NNS epidermis))))))))))))) (. .)))
Extracellular matrix components (primarily collagens, proteoglycans and adhesive glycoproteins) and dermal cell processes close to the epidermal basement membrane become distributed in a microheterogeneous fashion, thus providing a changing substratum for the overlying epidermis.
(ROOT (S (NP (NP (DT A) (NN cell) (POS 's)) (NN membrane)) (VP (VBZ provides) (NP (DT a) (NN barrier) (S (VP (TO to) (VP (VB keep) (NP (NN extracellular) (NNS materials)) (PP (IN from) (S (VP (VBG mixing) (PP (IN with) (NP (PRP$ its) (JJ internal) (NNS components))))))))))) (. .)))