▁then ▁grown ▁into ▁call uses ▁which ▁then ▁are ▁further ▁grown ▁to ▁plant lets ▁and ▁finally ▁to ▁a ▁full ▁plant , ▁known ▁as ▁a ▁som atic ▁hy brid . ▁ ▁The ▁procedure ▁for ▁seed ▁plants ▁describe ▁above , ▁fusion ▁of ▁m oss ▁pro top last s ▁can ▁be ▁initi ated ▁without ▁electric ▁shock ▁but ▁by ▁the ▁use ▁of ▁poly eth yl ene ▁g ly col ▁( PE G ). ▁Further , ▁m oss ▁pro top last s ▁do ▁not ▁need ▁ph y to h orm ones ▁for ▁reg ener ation , ▁and ▁they ▁do ▁not ▁form ▁a ▁call us . ▁Instead , ▁reg ener ating ▁m oss ▁pro top last s ▁behave ▁like ▁germ in ating ▁m oss ▁sp ores . ▁Of ▁further ▁note ▁sod ium ▁nit rate ▁and ▁calci um ▁ion ▁at ▁high ▁p H ▁can ▁be ▁used , ▁although ▁results ▁are ▁variable ▁depending ▁on ▁the ▁organ ism . ▁ ▁App lications ▁of ▁Hy brid ▁cells ▁ ▁Som atic ▁cells ▁of ▁different ▁types ▁can ▁be ▁f used ▁to ▁obtain ▁hy brid ▁cells . ▁Hy brid ▁cells ▁are ▁useful ▁in ▁a ▁variety ▁of ▁ways , ▁e . g ., ▁ ▁( i ) ▁to ▁study ▁the ▁control ▁of ▁cell ▁division ▁and ▁gene ▁expression , ▁ ▁( ii ) ▁to ▁investigate ▁m align ant ▁transformations , ▁ ▁( iii ) ▁to ▁obtain ▁vir al ▁rep lication , ▁ ▁( iv ) ▁for ▁gene ▁or ▁chrom os ome ▁mapping ▁and ▁for ▁ ▁( v ) ▁production ▁of ▁mon oc l onal ▁ant ib od ies ▁by